
I have been using FSR stain remover for many years to remove stains from boat hulls in a bay after a long boat dock on the sub Gulf Coast. Works great with minimal effort, just apply and wipe off immediately. It also removes rust stains.

Black POR-15 Patch - 4 oz Filler & Seam Sealer with Ultimate Adhesive Properties - Repairs Holes, Cracks in Steel, Wood, and select Plastics - Reinforces Weakened Metal
12 Review

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Permatex 82180 Maximum Resistance Silicone
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Loctite Red 262 High-Strength Threadlocker - 1.69 fl. oz. Bottle (26231)
11 Review