Remove stain from fiberglass tub?

I recently discovered a red stain under the soap on my fiberglass tub. Any suggestions on how I could remove this stain. I tried clorox but it didn't help.
Any ideas? Thank you for your reply.
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Susan Thomas wrote:

Try a rubber eraser.
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This is what I use on my fiberglass tub:- http://www.limeosol.com/tub.htm
I haven't tried it on the same type of stain as you have but it does a SUPER job on the marks that I could not remove with anything else.
--
Lewis.

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I know a guy who claims cream of tartar in lemon juce works great--make a thick paste. I use Bon Ami--"Hasn't scratched sine 1886" or something like that. Try them in an out-of-the-way place first, of course. (sometimes I steal some 0.1 micron diamond paste from the SEM room, but that may be overkill)
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