Also want to throw this product out there. FSR, fiberglass stain remover. (beats Mary Kays and On/Off) I mix it in a spray bottle and cut it with water. Have to shake it up to break up the gel and keep the pick up from getting clogged. Spray on, hose off after a few minutes. Took rust stains of the rear doors of my truck (from the hinges) Highly recommend keeping bottle on the boat. Works great on waterline brown scum too!
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