There is a easier way to remove stains from your boat.
Bernie’s Boat Wash
2 gallons of Hot Water
1/4 cup of Oxalic Acid (it’s a wood bleach, purchase in hardware store)
1/4 cup of Ivory Liquid Dish Soap
Rinse boat, let set for 5 minutes.
Apply boat wash with sponge or brush.
Rinse off boat wash.
When dry use Nu Finish Car Polish (orange bottle-black cap, purchase in auto parts store)
Will last all season!