Cleaning a Fiberglass Tub

Cleaning Fiberglass Tubs and Showers

What's the best way to clean fiberglass tubs and showers?

Thank you!
Michelle Jenkins from Swan Lake, MT

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RE: Cleaning Fiberglass Tubs and Showers

I like CLR for my bathtub but it is metal. I have a fiberglass surround and just recently found a cleaner that is working well for me. It is called KABOOM I purchased this at Walmart for about $3. (03/06/2006)

By dpcw

RE: Cleaning Fiberglass Tubs and Showers

I have tried many of these products and they all are good, but they cost money. I have found that for my shower and tub both which are fiberglass, I use cheap hair shampoo. I get a lot of it from my son who travels a lot in his job and he brings me the hotel bottles once or twice a year. I use the plain hair shampoo and a "net" scrubber I made out of onion and potato bags. This cleans very well. Sometimes I fill my tub up w/water and then after I have cleaned the sides of the tub or shower I take my string mop and swish it around in the water and mop the tile floors w/the solution that I just cleaned the tub with. This saves me time and money! I use plain old vinegar and water sprayed on the chrome faucets to clean them and they shine right up. I also use the hair shampoo in my toilet and then use an old fashion toilet brush to finish the job. This is a lot cheaper than anything else I have found and just as good if not better. Hope this helps someone save money and time! (03/06/2006)

By COOKIEPOM

RE: Cleaning Fiberglass Tubs and Showers

Well water here is heavily with minerals along w/much iron and silt. It cakes on quickly and discolors everything it touches from orange to black. I'd despaired of ever returning the appliances to all-white. As a last resort, when The Works for cleaning tubs wasn't strong enough for my need, The Works disinfectant toilet bowl cleaner was tried. Rather than ruin the tub, as I'd feared, it actually took away some layers of muck! It took several re-applications to get rid of most stains. You can leave it on for hours w/o marring the finish. Of course, it does wonders for the commode. (03/06/2006)

By gator10tx

RE: Cleaning Fiberglass Tubs and Showers

The best way to prevent the build up of soap film and other build ups is to simply wipe down the shower from the top to the bottom with a towel after each use. This will take off all the soap film and water.Then you will never have to scrub the shower or tub again to remove the soap film.However,if there is a coating of soap film I suggest you buy a non scratch scrubbing pad from 3M and other companies available at your local super market and scrub with any soap product. (03/07/2006)

By Dean

RE: Cleaning Fiberglass Tubs and Showers

Amen to the "WORKS" toilet bowl cleaner. We also have well water and this stuff works like a charm. I was also afraid it would ruin the finish but the tub was starting to look so bad that it couldn't make it look any worse, so I tried it and it did a beautiful job with no damage to the finish. The iron stains just disappear right in front of your eyes. It was unbelievable. I use it all the time. It does have an awful odor to it but I can live with that. And the best thing is I got it at the dollar store for $1.00. (03/10/2006)

By nana6x

The Works toilet bowl cleaner will ruin Chrome ...

I changed the subject title on my post so you would notice. After exhausting ALL means of cleaning a friends tub, I too tried Snow Bowl toilet bowl cleaner. It RUINED the chrome on the tub drain!

It made the chrome bubble and peel. So unless you want to replace that I would not recommend using it on the tub. It does help on enamel. DON'T use it on refinished tubs, ones that have the enamel replaced or recovered (sorry I forget the proper term).

This post brought back a bad memory, so I had to post my experience. (03/10/2006)

By Ariela

RE: Cleaning Fiberglass Tubs and Showers

If you use body soap instead of bar soap cleaning the tub is a breeze. it is the wax in the bar soap that leaves soap scum. So it only makes sense to do away with the wax and use the liquid or body soap. (04/26/2006)

By WJMILES

RE: Cleaning Fiberglass Tubs and Showers

Thanks everybody for giving me ideas for excellent fiberglass cleaners (these should work well on my hot tub, too).

Just a quick note after reading all these entries: soap scum is a mix of body oils, dirt, and the fatty salts that are formed when the calcium, magnesium, and iron in your water react with your soap. Some bar "soaps" are really bar "detergents" (slightly chemically different from soaps) and don't cause as much buildup as real soaps. And soaps need not contain talc to cause soap scum. (07/27/2006)

By ziply

RE: Cleaning Fiberglass Tubs and Showers

My husband and I used to manage apartment complexes and had to clean several filthy bathrooms after tenants would move. After speaking with a fiberglass shower distributor we found out that they always recommend fume-free oven cleaner to clean fiberglass showers. (Be careful if you don't use the fume free) Simply spray it on, let it sit for about 20-30 minutes and then wipe it off, and rinse. On really bad areas you may have to do a little more scrubbing. I also found that for the bottom of the tubs where the fiberglass is textured, the Mr. Clean eraser pads with the scrubby side work perfectly. The showers in the apartments have been there for 15 years and after my husband and I would clean them our managing agents would evaluate the apartments. They told us they have never seen a cleaner shower/tub than they had after we finished cleaning!

Seriously... Mr. Clean Eraser Pads and Fume Free Oven cleaner are the best. Heavily recommended by experienced users and professionals! (10/25/2006)

By Lindsay

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Cleaning a Fiberglass Tub

I have a fiberglass tub (or as I call it, a plastic tub) and I can not get it white. I have cleaned it with all the cleaners they have to offer and it still will not come clean. Does anyone have any advice?

Thanks,
Melissa from New York

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RE: Cleaning a Fiberglass Tub

I have had great success using equal parts vinegar and baking soda. Start with 1/2 cup. The baking soda acts as a gentle cleanser, while the vinegar is a good overall all cleaner. Best of all, it is easy, environmentally friendly and very inexpensive to use! (06/02/2003)

By NCOZADD

RE: Cleaning a Fiberglass Tub

Here's an older question similar to this one:

http://www.thriftyfun.com/tf000735.tip.html

There are lots of good answers here so check it out.

It sounds as if the surface of your tub may be damaged. There may be no way to get it clean no matter how much you scrub and I'm sure you do scrub. You could try a product like "Zap" that claims to restore fiberglass. I haven't used it myself so I don't know how well it works.

You could try using very fine 000 steel wool (this is super fine, don't use regular steel wool as it will scratch) or baking soda (rub it in good) and see if that will remove the stains. The cleaning products may have damaged it more rather than helping.

You may need to have your fiberglass tub refinished or restored. No matter how much you clean, once the surface is rough, it will not look shiny and will absorb dirt. Fiberglass tubs need to be cleaned with care so that you don't rough up or scratch the surface.

It is possible to do it yourself but you will need to study up on fiberglass resins, preparing the surface, how to apply them, etc. If it is your only bathing area it could be inconvenient and you'll need good ventilation. All in all it might be easier either to live with it, hire a professional or get a new tub.

http://www.refinishingonline.com/fiberglass_repairs.htm (06/10/2003)

By Susan

RE: Cleaning a Fiberglass Tub

Hope these recipes are helpful in cleaning your fiberglass tub. We have a 75-year-old cast iron tub so I can't attest to the effectiveness of these fiberglass cleaners.

FIBERGLASS CLEANER

• 1/2 C. vinegar
• 1/4 C. baking soda
• 1 C. clear ammonia
• 1 gal. warm water

Mix well. Wear rubber gloves, and work in a well-ventilated area.

FIBERGLASS SCOURING CLEANSER

• 1/2 C. soap flakes
• 1 1/2 C. hot water
• 2 tsp. borax
• 2 to 5 tsp. whiting

In a large plastic bowl, mix soap flakes and borax into water until dissolved. Add whiting gradually, checking the consistency and degree of abrasiveness after each teaspoon. Pour mixture into a squeeze-top container. Squeeze some of the cleanser onto a sponge and then wipe down the fixture. Rinse and dry.

FIBERGLASS TUB FLOOR CLEANER This is to be used only on the irregular bottom surface of the tub - not on the smooth surfaces.

• 3 C. baking soda
• 1 C. borax
• Fine drywall sandpaper

Mix baking soda and borax together. Work the cleanser in with the drywall sandpaper and then rinse well.

GOOD LUCK! (06/16/2003)

By FlaKathy

RE: Cleaning a Fiberglass Tub

Clean with a soft scrub or what I use is called "Best Bet". It can be bought through a professional janitorial company called "All Vac Janitorial". You need to rub, the product in and let it set, dwell about 5 - 10 minutes and rinse it off. after the tub is cleaned you can do routine cleaning with "fiberglass magic". You can buy that at Menards. This product will shine and keep the water marks away. another "polish" you can use only on a shower surround, where you will not be standing to slip on is after it's cleaned or a small routine cleaning again is to use pledge furniture polish. It'll look like brand new again! (07/28/2003)

By Kimmd

RE: Cleaning a Fiberglass Tub

We used to own a fourplex that had very old bathubs from when it was originally built in 1963!

We had one that was Pepto Bismol pink, one that was baby blue, etc. ha ha They were all stained horrendously from years of use. We bought a bathtub paint that we repainted the tubs with. You can get it at Home Depot for like $12 a box.

Those tubs looked BRAND NEW! Nobody could believe it! The downside it that it is a toxic smelling paint. You must have ventilation and air out the room for several days. It was well worth it for us, but we had empty apartments as we did it. If you have a second bathroom to use, it may be worth it for you as well. (05/07/2004)

By Tawnda

RE: Cleaning a Fiberglass Tub

My 11 yr old fiberglass tub needed HELP! I bought CLR in the yellow trigger-spray bottle from TARGET. Sprayed on, waited 5 minutes, and gently scrubbed with a mesh covered sponge..WOW! I need sunglasses! Try it! (08/13/2004)

By Kathilee

RE: Cleaning a Fiberglass Tub

I had the same exact problem! We have very hard water and the bottom of my tub was a nasty, dingy gray! I bought some Bar Keeper's Friend and I used that. Follow the instructions on the can. It's a powder. You wet the tub down and then I sprinkle it on and use a scrub brush. It took every bit of the gray out and it's sparkling white again! I use that and then rinse it good. After that I spray my entire tub and shower down with Clorox Clean Up and wipe it down with that to make sure the germs have all been killed. (12/29/2005)

By Robin

RE: Cleaning a Fiberglass Tub

I have fiberglass tubs also and they are really tough to clean! Also, at age 75 I have problems getting down on my knees to reach the corners. The best way I've found thus far is to have a little water in the tub and make a paste with dishwasher detergent (powder form). Then I scrub with an old straw broom. Still calls for some "elbow grease", but I can work from a standing position and the results are satisfactory. Beth (12/30/2005)

By Beth

RE: Cleaning a Fiberglass Tub

I thought we had the same problem with our newly installed tub too. Scrub away to no avail. Complained to the company who inspected the tub & they told me that "sometimes" the fiberglass that is sprayed on during manufacturing does not go on evenly and may leave areas when dried showing grey areas & may leave the tub looking dirty. Since they didn't want to cover the costs of labor to reinstall a new built in...We got the tub for FREE! How's that for being thrifty? This maybe your problem too, that is if the tub isn't too old... (12/30/2005)

By Streatch

RE: Cleaning a Fiberglass Tub

I have a newer tub, about 10 or 11 years old now, and it still looks like new. I can tell you what I have used to keep it that way, but am not sure if it will restore it. The things I have used are what I have used on our fiberglass boats to make them look shiny and new, while protecting them from salt water, scum, etc. Try "GEL-GLOSS." It is a one step cleaner and polish for fiberglass, marble, or acrylic that cleans, seals, and shines. It comes in a 16 oz. can. It is made by TR Industries, 11022 Vulcan St., South Gate, CA 90280.

I have also learned how to keep from having to use the above product. I use liquid Spic and Span and a sponge that has a soft scrubbing cloth on one side. I say soft because it shouldn't be one that's used for scrubbing burnt food from pans as it might scratch the surface. Monthly I use liquid Spic and Span full strength, rub the tub/shower down to remove scum, and only use the scrubber side if the minerals, rings, or soap scum, etc. seem to be hard to remove. When done, I turn on the hot water and spray the tub and shower walls down, wipe down with a soft rag or squeegee and it shines like a new penny! Good luck! (12/31/2005)

By Thissie

RE: Cleaning a Fiberglass Tub

Try using Greased Lightning - Multi-purpose cleaner (sold at Walmart among other places) and a scrubber that will not scratch your fiberglass. Our water is terrible here and discolors our tub and shower. I spray on, wait a little bit and usually spray again and use scrubbing pad to clean tub and/or shower, but it works. If I did not get it the first time, I try again. Please allow plenty of ventilation. Good Luck--Crystal of South Carolina (01/02/2006)

By cr8zecrafher

RE: Cleaning a Fiberglass Tub

BAR KEEPER'S FRIEND! This is the best cleaner. It cleans fiberglass, glass, stainless steel, copper, brass, tile,porcelain, even plastic! Removes rust! A must in every household! It comes in a gold can with blue/white writing. This product has been around since 1882!!! It comes in a liquid and powder form. I prefer the powder. Mix like a paste. For stubborn spots apply with a toothbrush(always) and go do another task come back in 20 to 30 mins and you will be amazed at the effort you put into cleaning. I especially like the results in my fiberglass tubs, porcelain sinks/stainless steel faucets, stovetops and scuffs from shoes on my lino from guests shoes. Try it you'll love it! Check out their website: www.barkeepersfriend.com or call 800-433-5818. I get it from my Savemart grocery store for $2.09. But I've seen it at Bedbath&Beyond for a little more. Happy cleaning! Jennifer CA (01/03/2006)

By Jennifer,CA

Hey Sitti

Try salt and lemons. My husband thought I was nuts when I asked him to pick them up at the supermarket, but it works. Cut the lemon in half, use a TON of salt (you need enough to make a thick paste) and scrub away. The lemon is optional, it will work with just salt and a cloth, but the lemon juice does seem to help and the fibrous innards do some scrubbing and hold some of the salt paste in place.

Our shower/tub had the same problem yours did, but a one-time application of the salt and lemon (it does take a little elbow grease) can get it clean enough that you can use the no-effort cleaners for a long period after that. (01/18/2006)

By Niki

RE: Cleaning a Fiberglass Tub

I feel your pain. We have well water with high iron content and we use "The Works". It's the best solution we have found. Our toilets have never been so white! We found it at Dollar General for a dollar and bought about 10 so we wouldn't run out for a while. They make several different types for differing surfaces.

Good luck! (07/05/2007)

By DBE

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Cleaning Fiberglass Tubs and Showers

I am trying to find a way to clean hard water from my fiberglass

By Hickory

RE: Cleaning Fiberglass Tubs and Showers

Kaboom is awesome I ave been cleaning house and apartments for the last 25 years This is one of the best cleaning agents out there! It will not eat away the metal on anything you use it on Its safe to use on kitchen faucets and shower heads with plastic too (01/04/2007)

By Firedancer67

RE: Cleaning Fiberglass Tubs and Showers

I had heard about using the fume free oven cleaner on tubs but I didn't think it meant on fiberglass tubs so I was always too chicken to actually try it. Has anyone actually done this? I'd sure like to know. I usually use Scrubbing Bubbles. Just spray it on and let it work while you clean up the rest of the countertops, sinks, etc. Then I take the Mr. Clean Magic Reach scrubber to it, rinse and it comes out pretty clean and shiny. The scrubber works pretty well on its own, but with the Scrubbing Bubbles it is a bit less elbow grease. (01/10/2007)

By mef1957

RE: Cleaning Fiberglass Tubs and Showers

Thanks to the person who suggested using Mr Clean Magic Eraser. I tried all the other suggestions and this is the only one that worked. I most have tried 10-15 different cleaners and none worked. I even tried Fume Free Oven Cleaners. It worked OK but nothing like the Magic Eraser. Thanks again, you just saved me $150 because I was ready to replace the shower box. (02/21/2007)

By Grady

RE: Cleaning Fiberglass Tubs and Showers

I've used ELIMINATE Advanced Surface Care Shower Tub & Tile Cleaner for at least 10 yrs. Wonderful stuff. The container says it's biodegradable, & for some reason I thought it wouldn't hurt to breath the fumes? But I don't see that on the bottle. Anyway just spray it on, let it penetrate for 15 min then use the hot water out of my removable shower head to wash it down, and it worked really great, I did have to scrub sometimes. Unable to find it at the home supply store lately, I ran the web site at www.unelko.com & I guess I can order it online, they also have other cleaning solutions on this site. (03/03/2007)

By Judy Wells

RE: Fume free oven cleaner on fiberglass tub

I have a follow up question for those who have used fume-free oven cleaner to clean fiberglass tubs. How does the oven cleaner affect the finish on your tub's metal parts? I have a large fiberglass jacuzzi with stainless steel and chrome jets that I fear will be damaged by the oven cleaner. Any experience? Thank you. (03/20/2007)

By JSC

RE: Cleaning Fiberglass Tubs and Showers

Thanks for all the info. I just had a fiberglass shower pan installed with a chrome drain. I was worried the caustic cleaners would mar the finish. Looks like Kaboom or fume free oven cleaner is a good choice. (03/25/2007)

By ValJean

RE: Cleaning Fiberglass Tubs and Showers

I just found the solution. It's Soft Scrub Deep Clean Foaming Cleanser with a Scotch-Brite Heavy Duty Scour Pad (The kind without the sponge on the back). Foam it on and let it sit only 2 minutes and scour it off. Very little "elbow grease" is needed. Never simpler! Then I put on a really good car wax, except on the bottom of the tub (I use Stop Wax) and you are good to go! (06/18/2007)

By pepper

RE: Cleaning Fiberglass Tubs and Showers

ELIMINATE Advanced Surface Care Shower Tub & Tile Cleaner - I can't find this product anywhere on the net - where do you purchase it? (11/06/2007)

By la

RE: Cleaning Fiberglass Tubs and Showers

The best product I've used to date is Soft Scrub. Works great with a small amount of elbow grease. Rinses off easily with water. (11/16/2007)

By the cleaning guy

RE: Cleaning Fiberglass Tubs and Showers

My ivory fiberglass tub is discoloring to a yellow on the bottom four inches. We are on well water and it is very hard and sulfur smelling. I can't even get the hard water marks off the ring where the water sits in the toilet. I can not get the works product it must be from the USA. Any other suggestions? thanks (12/17/2007)

By susan

RE: Cleaning Fiberglass Tubs and Showers

To remove body oils and soap scum, use Dawn Dish Soap. As the commercials shows they use it to remove oil from birds caught in oil slicks, well it works great in the bathtub and shower. If you really have a BAD build up, use Dawn and Magic Eraser. I once cleaned a tub in a rental house and thought that there was NO HOPE of getting the tub clean, but Dawn and Magic Eraser did the trick. (01/18/2008)

By Sandy

RE: Cleaning Fiberglass Tubs and Showers

WARNING about The Works (either one). I used The Works on my old white laminate counter top and a newer fiberglass tub surround. I have hard water & The Works really got it looking clean and new. However, after a about a year or two the cleaner had removed all of the protective coating on both surfaces. In the end, even shampoo would stain my tub. Everything was absorbed into the surfaces after using The Works for a while and it ended up worse. I only recommend using The Works if you're going to replace a surface in a year. The Works is GREAT ON TILE AND CERAMIC surfaces! Not good for laminates or fiberglass finishes though. (03/18/2008)

By Kim

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Cleaning a Fiberglass Tub

We have a fiberglass shower and bathtub installed in our home. The bathtub's still in very good condition. It looks dull because of the soap buildup. I have tried cleaning it with Bon Ami, polishing cleanser which is recommended for fiberglass. And I have tried using Simply Green liquid cleaner. No matter how hard I scrub, I can't remove the dull soap scum.

What product can I buy to remove the soap so it at least looks clean and somewhat new?

I will thank you for your suggestions.

Marge from NY

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RE: Cleaning a Fiberglass Tub

My parents also have a fiberglass tub and have found a product that just works wonderfully! It's called Barkeeper's Friend--it's awesome. Takes away a lot of the scrubbing, we use to do on it! If your tub is really bad, try using that and a Black and Decker Scumbuster. Good Luck! RoxyLea (09/19/2007)

By RoxyLea

RE: Cleaning a Fiberglass Tub

"The Works"! I get it at Dollar Tree and it will melt anything off of fiberglass with minimal scrubbing. I used one of the Mr. Clean long-handled scrubbers and the pad for tubs. Works perfectly. I even used The Works to kill iron staining from my sister's shower. They thought I was a magician! It's really good stuff and cheap at Dollar Tree. Granny (09/21/2007)

By Granny Marcia

By MCW

RE: Cleaning a Fiberglass Tub

I love Windex type cleaners for cleaning any type of sink or tub. Its the greatest for removing soap scum, as it has ammonia. (Its makes diamonds sparkle) It doesn't leave water spots on your faucets.

I hope you haven't worn off the finish on your tub by scrubbing it. Have you tried just plain baking soda? I had a stain in my cast iron tub that I couldn't remove. A friend suggested I try plain old baking soda. It worked better than cleanser! Best of luck. (09/23/2007)

By Carol in PA

RE: Cleaning a Fiberglass Tub

I too, have a fiberglass tub. One thing that helps immensely is a water softener if you have hard water. It makes it much much easier to clean all sinks, the toilet, and the tub. I also only have to use half the soap or detergent in the dishwasher and washing machine and my skin is much less itchy in the winter. (09/24/2007)

By Lynn

RE: Cleaning a Fiberglass Tub

Mr. Clean Eraser is my favorite newest addition to a cleaning arsenal for hard surfaces, without damaging the surface I am cleaning. It uses plain water and elbow grease. Once the soap scum, stain, or ground in floor dirt is erased, seal the area. Linoleum floors I seal with Beacon Wax, Veneer counter top and Fiberglass tub/shower stall with "Gel Coat". Windows dry with window chamois. Mr. Clean Eraser removes Kool Aid stains from white counter tops. I was sold. Wouldn't want to live without one in the house ever again. 3/30/08 (03/30/2008)

RE: Cleaning a Fiberglass Tub

You won't believe this but it works. My fiberglass tub sparkles like new: Here is what I used (in this order)

• Strypeeze (Savogran Co.)
• Mineral Spirits
• No 7 Heavy Duty Rubbing Compound (Cyclo Industries)
• No 7 White Polishing Compund (also by Cyclo industries)
• Meguiar's Mirror Glaze #6 Professional Cleaner Wax

Wear gloves. Follow the directions on the labels. It takes a lot of elbow grease to do the initial cleaning. Use Foaming Scrubbing Bubbles to clean the tub after you bathe. Spray it on and wipe it down. Every 6 months - 1 year re-apply a coat of Mirror Glaze to continue to protect the surface. (06/04/2008)

By Susan

RE: Cleaning a Fiberglass Tub

Top Job liquid cleanser works great on my new shower enclosure and fiberglass tub. I use a plastic scrubbie that is sold in the dish soap section used for washing dishes. It is so quick. You can start scrubbing as soon as you spray. It looks like new every time (06/23/2008)

By Gloria

RE: Cleaning a Fiberglass Tub

I have used everything on the market. I recently used Zap Fiberglass Restorer, and it took my tub and surround back to brand new. You can only find it on line I haven't been able to find it in stores. (08/28/2008)

RE: Cleaning a Fiberglass Tub

I found that 3M products work well. I went to their website and found Color/Gloss Restorer. It claims to revive dull gelcoat surfaces. And it does!! I just used it on our fiberglass tub and it works great. I am now going to apply 3M Marine Finesse-It II Finishing Material to give it a wet look shine. It then recommends using the 3M Marine Ultra Performance Paste Wax. I do have some but am not sure I will use that. Will see how tired I am when I get to that step. (10/25/2008)

By Val

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Cleaning a Fiberglass Tub

How do you clean a fiberglass bathtub and sink?

By church1040 from Dubuque IA

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RE: Cleaning a Fiberglass Tub

Baking soda & vinegar, good luck. (04/01/2009)

By kffrmw88

RE: Cleaning a Fiberglass Tub

I use Mr. Clean Magic Erasers (they now come in generic brands too - works the same, but cheaper). Wet the sponge, squeeze out the water and scrub that crud right off the tub. Works like a charm and believe me, I had tried everything before someone told me about these little beauties. Good luck! (04/08/2009)

By Sheryllynn44

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Cleaning a Fiberglass Tub

I have a fiberglass bathtub with the walls and shelves attached. I can't seem to get black mold spots out of the grout attaching the tub to the walls no matter how hard I scrub. Do I have to re-do the grout?

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Cleaning Fiberglass Tubs and Showers

What is good for cleaning fiber glass tubs and walls? I have never had fiber glass before and not sure what to use.

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Cleaning Fiberglass Tubs and Showers

What is the best way to clean fiber glass tubs?

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Cleaning a Fiberglass Tub

I am trying to get my house together and my bathtub is a mess with so many stains. What can I use on a fiberglass tub?

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Cleaning Fiberglass Tubs and Showers

I would like suggestions for cleaning fiberglass tub walls.

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Cleaning Fiberglass Tubs and Showers

My fiberglass shower is gross, probably beyond repair. Any suggestions for attempting to clean it? Thank you.