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I was cleaning my paint brush, bucket and roller in my bathtub. Afterwards I noticed that I stained a couple spots of the bathtub. The stains are a light blue (the paint was a dark blue). I am not sure of the material of the bathtub but it is the common material you see a lot of bathtubs in apartments (The closest thing I would relate it to is fiberglass with a white shiny glass but I don't know/think it is fiberglass). It isn't dried on paint (it feels completely smooth and looks like a stain).

How can I remove the stain? I have tried scrubbing, baking soda and water (paste), baking soda and hydrogen peroxide(paste), and bleach but I haven't got it off yet. I could try scrubbing harder but I am afraid of harming the tub itself.

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If not a gel coat on fiberglass, its an acrylic. – HerrBag Apr 9 '13 at 22:30
Saw one suggestion to make a paste with Ajax power 3:1 with water, 15 min then rinse off (don't scrub). – HerrBag Apr 9 '13 at 22:59
Three possibilities: Ethyl alcohol (vodka), Vinegar (5%), Ammonia (5%). Soak a towel with each and let it sit on the stain for a while, rub arounf a bit and rinse. If the dye is a metal comples, you might also get lucky with a paste of borax (it's a good chelator). – Wayfaring Stranger Apr 9 '13 at 23:17
I also tried Ajax paste (which might be the same as borax?) I'll try the other three. – Michael Apr 10 '13 at 19:02
@Michael no, borax is different, found in the laundry aisle at the groc store: – Wayfaring Stranger Apr 10 '13 at 19:24

1 Answer 1

If the tub material is fiberglass (and most commonly are) the best way to remove any blemish is with an orbital sander and some 300 600 and 1000 grit Wet and Dry sandpaper. Using a spray bottle filled with water wet the stained surface. Starting with the lowest grit sand and keep the area wet. Let the sander do the work. No need for hand pressure. Watch how fast the stain is being removed (it should go quickly. Move through the grits and spray to keep surface continuously wet. The paper is of such a fine grit it will not leave any discernible scratches. When completed apply a cleaner/sealer for fiberglass.

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