I had a few brown spots on my fiberglass steps and swim out. Tried a puck, nothing happened. Got some vitamin c, put a few in a piece of an old white t shirt, whacked them with a hammer a few times and then just rubbed on the stains. The stains came up almost instantly. Was simply amazing how easy it was to get them up.
I think I will just wait and see what happens, if they come back I am thinking no big deal to just do the spot treatment every now and then. I am thinking a full asboric acid treatment would be over kill for these few spots. Any opinions?
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