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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: en.wikipedia.org/wiki/Borax –  Wayfaring Stranger Apr 10 '13 at 19:24
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