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Green Mountain A29 corrosion remover does a great job of removing rust from stainless (or steel). Also helps with corrosion of chrome plated equipment such as winches. This stuff seeps down between bolts and nuts (and chainplates) and helps to remove surface rust from any metal it can reach. I find that brushing or scrubbing is very rarely required. Just squirt it on, wait, and rinse it off. It's not supposed to hurt fiberglass, although I've never left it on the fiberglass for very long--wipe it off with a rag or paper towel.
FSR should take care of the stains on the fiberglass. Use it specifically as directed on the container.
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