You've probably thought you heard it all about help with stains

[reelapeelin]

Originally Posted by HookedOnMarsh

Yeah what Reel said to use is the way to go. I wonder if one of those acids in it is oxalic acid? I use a Attwood product from Wally that contains oxalic acid. It is pretty powerful stuff. Will take the top layer of your skin completely off leaving your hands feeling like you got dried glue all over them if you don't wear gloves while you sponge it on.
I love the stuff, sponge it on, watch the stains turn white like magic, then spray off with a hose. Scrubbing with the sponge on any stubborn spots usually gets everything off. Then I use some wash and wax and it looks beautiful again.

Yes, Oxalic acid IS one of the acids in On & Off...the one shown in the link is formulated specifically for use on FIBERGLASS...DON'T get it on painted surfaces or aluminum trailers...