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I cringe at all the harsh stuff people suggest for cleaning their boats. Save that stuff for the last resort

Booyah will clean all your tannins and isn't harsh. No need for gloves or having to worry about metals. Just apply and watch the tannins melt right before your eyes. It's pretty satisfying.
 
Bar Keeper's Friend is oxalic acid with a little grit to it. I've found it doesn't necessarily scratch polished gelcoat, but I'd be careful with it. That being said, it is great for stains and I use it to prep before any heavy compounding. It helps remove some oxidation. It doesn't work well for mildew, but that's a better job for bleach.
 
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