Rust stains can get on your tub either from old plumbing or from metal objects left sitting around the edge. These stains can be removed from your tub by using the proper cleaning products. This is a guide about removing rust stains from a bathtub.
Here are questions related to Removing Rust Stains from a Bathtub.
I was surprised at how well The Works works. Rust on my fiberglass tub just kinda disolved away after 10 minutes. I was also surprised at how useless CLR and bakingsoda/vinegar were. Just beware The Works smells strongly of rotten eggs buts it's worth it.
I have a white porcelain bathtub that was heavily stained with rust when rusty drain clearing cable was left spread in tub. Sprayed the tub, sprinkled Bar Keepers Friend on stain. Wet cloth and lightly scrubbed the tub. The rust disappeared 90% first application. Repeated day latter only traces of faint rust shows I am not sure how many times I can use BKF, their web site says remove after one minute.
As far as I am concerned it depends on what your bathtub is made out of. For my metal tub I really like to use CLR in the yellow spray bottle, which I purchase at Walmart. But my tub surround is fiberglass and the CLR doesn't really do the trick for that.
For the tub surround I use something in a purple bottle with a green top. It is called Kabam or Kazoom, or something like that. If you look for the see through bright purple bottle with a green top you found it. I buy it at Walmart. If you have a big build up, it will take more than one application and some scrubbing. Once you actually get it cleaned, if you just spray it on and wait a minute you can wipe with a sponge and rinse.
I use Clorox Cleanup. It's great for tubs and sinks and is non-abrasive. (03/30/2006)
By Claudia- MD
RE: Rust Stains in the Bathtub
I know this sounds a little crazy, but it works. It's called "The Works" toilet bowl cleaner. We have well water and it has a lot of iron in it. I just squirt The Works on it and let it sit for a minute and it wipes right out. I live in a mobile home so I have fiberglass sinks and tubs and it has never damaged them. Make sure it is the toilet bowl cleaner though. They make another product for soap scum and lime scale, but it doesn't work for rust. Good Luck! (03/30/2006)
Hi, If you live in the states there is a cleanser called ZUD, it is in a container like Comet Cleanser. We can't get it in Canada anymore, but my friend got me some in the states. Works really good and fast. (03/30/2006)
RE: Rust Stains in the Bathtub
As Nana6x said, The Works, works very well. My conditions are like hers. I've left the stuff on over-night w/o problems.
Another idea, when you have the time. Use a fine/small grain of sandpaper; used it when I was out of the former and wasn't going into town anytime soon. The rust build up can be so thick but I've not seen any 'wearing' on the fiberglass tub. It does a fine job; also works on stainless steel kitchen sinks. (05/11/2009)
I am thoroughly amazed at how well The Works did on my tub. My husband just squirted some on a sponge and wiped the rust in one swipe. it created a very clean stripe down the wall. We have been scrubbing and scrubbing at this tub, trying to get the rust stains off the wall and tub itself. We tried Lime Away, CLR, and Kaboom. None of them worked, and you were worn out just trying. Thank you for the suggestion of The Works. I'm so glad I found this site. (10/31/2009)