Boat cleaner for dirty boat

Clean the excess crud off with whatever cheap cleaner you usually use and a rinse with a high pressure washer, then oxalic acid ..... mixed with a bit of wallpaper paste to make a gel, or a bit of washing up liquid to make a foam - scrub into grubby, rust stained fiberglass and watch it return to its original colour in minutes. Use on a warm day, not much happens until it's in the high teens.

OXALSÄURE 1 kg Pulver Kleesalz Kleesäure Bleichmittel 99,62 %ig | eBay
 
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