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Old 09-09-2012, 06:22 AM
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Boat guys use ospho to reduce or clean up stains in fiberglass that occur from the stainless pieces that rust. It has to soak for a bit. It is phosphoric acid. It might work...dunno.
CLR may have phosphouric acid in it, I dont know.It supposed to clean up rust stains too.Just a thought.
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