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I have a stainless steel thermos and had always cleaned it with Crystal dish soap and had no problem. I was always using tea, however this time I used liquid dish soap. The man used coffee with the cream in it and the coffee came out tasting sour. What happened?
I wanted to be the third to say thanks for the tip on hydrogen peroxide and baking soda. I cleaned both a thermos and a baking pan (cookie sheet) that had Thanksgiving sweet potatoes residue stuck on it -- I didn't want to scrape off the non-stick on the pan, and the mixture worked great.
Do mix the hydrogen peroxide and baking soda in a thermos or glass or some other container so you can shake it and mix everything before pouring in on the baking pan. Otherwise clumps of baking soda might block the solution from cleaning parts of the pan.
Back to the thermos cleaning: I also experimented with how much hydrogen peroxide is needed. I found that about 1"+ of hydrogen peroxide, and then regular tap water combined with about 1/5 box of baking soda set over night would clean a moderately coffee-stained thermos just fine. I did what others suggested, and put the lid on and shake it first, and then remove the lid. I let the thermos sit overnight, and dumped the floaters and any undisolved baking soda in the toilet. It might not have clogged the sink, but I didn't want to take a chance.
Thanks again to those who gave this initial tip!
Went online this morning to ask if it was safe to clean a stainless steel thermos using bleach. What I got was suggestions to use hydrogen peroxide mixed with baking soda and water or, dishwasher detergent (Cascade) and boiling water. I chose the "Cascade" method. This worked wonderfully; cleaned my coffee blackened, large thermos to a like new finish in 15 minutes with just two rounded tablespoons of detergent. Thank you David K., JMRoss, Susan from ThriftyFun, and others who suggested this method. Thank you also, Sandy, for letting me know bleach was a bad idea, that it would damage the seal/weld.
Did you rinse it well enough?
Maggie is right. Start over and clean again with baking soda. It's a little bit abrasive, just enough to clean well.
I'm going to assume you know how to cleanse and rinse properly as you've been already doing that.
I'd say the cream was probably sour.
This turned into a teaching moment for my seven years old granddaughter, Mikae'lyn. I added vinegar to the peroxide and baking soda and foam shot out of the carafe. So, we experimented. The result was from the acidity in the vinegar reacting with the baking soda. And...it cleaned it good! :<)
I needed my Thermos cleaned quick! I used about a half box of soda and at least a pint of hydrogen peroxide and the rest water. I have the biggest stainless steel Thermos I could buy actually made by "Thermos." It really works!! In about two hours it looked like new on the inside!
I have several Contigo stainless steel mugs very similar in design to a stainless steel Thermos bottle. Despite what you may read to the contrary a small amount of regular household laundry bleach does the job. If there is a visible seal between the inner and outer walls that is a weld the bleach will not affect it. Some old products that have the seal made with plastic, rubber or other substance will require care to keep the bleach solution away from the seal while soaking. (The seal is usually at the top. Just don't fill the container to the top.) Stains from teas tannin or coffees brown colored casein residue from creamer or milk do not penetrate the stainless steel. They sit on top. The bleach breaks the bond and the stains float off like magic.
You do not need an exact amount or concentration of bleach. Pour in a couple of inches of regular laundry bleach. About 2" in a stainless mug of 12 to 20 ounce capacity and add hot tap water until it is about ½" from the top. Use a little more in a Large Thermos bottle. Stand it aside in a spot where it won't get knocked over. Leave it there for at least an hour. When you empty and rinse it out it will look like it came from the factory. There is no scrubbing, brushing or any physical effort on your part. It just works. Any caps or covers can be treated the same way in a Tupperware container.
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Coffee stains in stainless steel thermos. How can they be removed?
Shirl from Medford, OR
Shirl, I think it's possible to mix up some warm baking soda and water and put inside the thermos and then let it set a while. If you have a long brush to use inside it, then you should be able to brush the stains right off. Just using the brush with sudsy hot water would probably work. It has for me in the past and I am always amazed at how clean and sparkly the inside of the thermos looks. I guess it just depends on how long the stains have been there as to how much work you have to do to remove. Hope this helps. (09/06/2006)
What works for me is a couple of tablespoons of dry dishwasher detergent, then fill the bottle with hot water. Leave a little room at the top and put on the cap. Shake every so often and let it sit overnight. It really works. Susan from ThriftyFun (09/06/2006)
I would try filling the thermos with water and then dropping in a couple of denture cleaning tablets. Let sit for a couple of hours. Then rinse well or wash as normal. I've used them to clean small flower vases, etc. (09/08/2006)
I have cleaned my stainless steel thermos by having a small handful of gravel from my driveway. Rinse off your gravel stones, put them with water in your thermos & shake it around real well. Then empty them out & wash out normally. Hopefully this should help you out. I don't know about coffee stains, but it may help. (09/08/2006)
I agree with Debbie 52. My husband worked Monday through Friday. Friday night, I would put sudsy hot water in his thermos and shake it vigorously. Then rinse it well. Add about 2 tablespoons of baking soda and fill with HOT water. Put the lid on and shake. In the morning, shake again and then rinse well. Clean as a whistle and ready for Monday morning coffee. Hugs. (09/08/2006)
Lemon Juice (fresh or bottled) or vinegar. First take about a cup of any one of these, swish it around the thermos without diluting it then mix in some water (about 1 part vinegar or lemon juice & about 3 or 4 parts of water) and soak at least a few hours or overnight, then rinse with warm water. This is how they recommend you clean out coffee pots, so if vinegar can clean coffee stains, I'm sure it will clean out your thermos.
One more option if none of these work. I've bought stainless steal thermos used at second hand stores before and to rid them of any germs, I've used a small amount of bleach (about 1 to 2 inches in the bottom) and added warm water. This worked great for me. Bleach works great on plastic and glass thermos too! (09/08/2006)
At work we have stainless coffee pots. I clean them with very hot water and dishwasher detergent. While cleaning I forgot about them, when I went back and rinsed them out they were the cleanest they have ever been. (09/11/2006)
I used to clean my stainless steel thermos with a retail product found at the grocery store called Dip-It. It worked great! A dry, granular product that you would mix with boiling water in the thermos. The mixture would bubble a little and in an hour or so all stains would be gone. My last package (8 oz?) lasted years and now I can't find it at the store. (02/24/2007)
Someone mentioned using bleach to clean a stainless steel thermos. This is very bad advice. The chlorine in the bleach, if it comes in contact with the weld near the top of the thermos will destroy that weld, and your thermos bottle will no longer keep liquid hot or cold. I found this out the hard way, and was informed of the dangers of bleach on stainless steel thermos bottles when I spoke to someone at the Thermos company. (10/01/2007)
The first time at your site someone suggested a dishwasher cleaning tablet (we use Electrosol) in the pot with hot water. I tried it and in 15 minutes my pot was spotless, and it was pretty bad as I had not cleaned it for several months. Previously I used stainless steel cleaner and scrubbed forever with a brush. Whoever sent in that tip thank you, thank you. A spotless pot with no scrubbing. (12/25/2007)
I've got it; hydrogen peroxide and baking soda. I tried everything to remove completely black stained thermos travel mugs and big thermos. After buying a new one and seeing how shiny the steel was, I became determined to find the ultimate cleaner. After reviewing everything on this and other sites, I experimented with hydrogen peroxide. After half an hour, not much happened. I added baking soda, magic! Without scrubbing or anything, I just rinsed them out and they were cleaner than the new one (we did have a few cups of coffee in the new one - so it wasn't spotless). I used a ratio of 2 parts hydrogen peroxide and 1 part baking soda. But, you can experiment. I don't know what the optimal amount is. Don't even bother trying anything else. It works. Period. (02/13/2008)
The Electrosol method works beautifully. Just drop an Electrosol tablet (mine had the power ball) and fill SS Thermos most of the way with boiling water. Shake every few minutes. After fifteen minutes, pour out the water and residue. Rinse a few times with clean water. Your Thermos will be gleaming on the inside. Amazing. (04/26/2008)
By David K.
Wow, I had a stainless steel pot that looked so bad I thought it had rusted through, completely black, the coffee that came out of it tasted horrible. I grabbed some Cascade (dishwasher soap), poured about one dishwasher loads worth in, then poured in boiling water (not hot water, boiling). Then I put the lid back on, and gave it a good shake ever 5 minutes for about 15-20 minutes. Poured it out and the pot was nearly spotless. Repeated this once more and then dropped in a paper towel and used a fork to wipe it around, and the thing looks like it just come from the store. Coffee no longer tastes horrid any more, amazing, if someone told me to do that I would have laughed, I thought the pot was a goner. (06/19/2008)
I tried the method listed above to clean a very stained stainless steel travel coffee mug. First, the bad news. I put in a small amount of Cascade, added boiling water, screwed the cap on and gently shook it. Well, the top seal of the mug blew out from the pressure spraying boiling water all over my hand. The good news is that despite the very short time the detergent was in there, the thing cleaned up like new with a little rinsing. So, be cautious with this method. (10/13/2008)
By Bob W
I had a stainless coffee pot that was about 2 years old and had lots of build up. I tried David K. post remarks and he is right on. Worked in 5-10 minutes. Thanks (12/04/2008)
By Douglas P
As odd as it sounds, salt and ice cubes in stainless steel coffee pots with a very little amount of water works very well. Add these three ingredients and shake it around. Amazingly it pulls even the worst coffee stains off of the bottom of an otherwise burnt pot of coffee (12/04/2008)
I just wanted to second where someone said to use hydrogen peroxide and baking soda. I have two thermoses and one of them was really nasty. It was totally black and I tried lots of different ways to clean it. Nothing worked. I bought some of the big hydrogen peroxide bottles from Costco. I filled the offensive thermos with it and used about 1/3 to 1/2 a normal box of baking soda. I put the top on and shook it hard and then took the top off and let it sit over night.
The following morning I saw a layer of black substance floating on top of the liquid. I dumped the hydrogen peroxide/soda mix out and rinsed it out. It was totally clean inside. It looked new, no exaggeration. I even showed my wife and she too was amazed. This really works and it couldn't be easier. You won't be disappointed, I promise. (12/11/2008)
I just used the dish washing/boiling water method for about an hour and it worked great! The other methods are probably fine, but for me this was the most convenient. (12/28/2008)
By Roger D
Oh my gosh you are all awesome. I have a Starbucks thermos coffee pot, so coated, coffee tasted terrible so I was looking to Starbucks for a replacement thermos. After not finding one, I found you all. I used Palmolive Eco liquid dish washing detergent, hot water, in less than 5 min of stirring the mixture 95 percent was gone. I had to go to work, came home another 5 minutes same treatment, the pot is totally clean. Thank you so much. (01/13/2009)
Incredible! I just used the Cascade liquid dishwasher soap method discussed here. I put a little less than a dishwasher loads worth in our Kitchen Aid stainless steel 10 cup pot, shook it a little to spread it evenly along the bottom, put a pot of water on to boil (about 5-6 cups of water) and then poured the water into the coffee pot that was sitting with the Cascade in it.
I put the sealed lid on the pot (I was careful to shake the pot moderately in a level position to let the pressure in the pot escape out of the vented pouring top, given the experience of one of the writer's below on it exploding a bit when the pot was not shaken to let it vent) and after about a minute of shaking, let the pot sit for another 2-3 minutes on the counter.
I then came back, gave the pot another shaking for less than a minute and then poured out the contents. It was incredible - the pot looked brand new inside with every bit of built up coffee crud removed. Definitely saved the pot from the scrap heap and since you know Cascade is safe since you wash dishes with it, I'm happy to just rinse out the pot and get fresh coffee the way it's supposed to taste.
Thank you to whomever figured out this cleansing recipe. It is a real demonstration on the power of concentrated Cascade, but it definitely gets the job done fast and easy with no physical effort. (01/31/2009)
By N Cheng