Uncovered the boat and every seat has these stains/mold. Doesn't come off to the touch. Any idea of the cause or treatment/cleaning solutions? Sits on fresh water lake. : r/boating
How to Remove Mold & Mildew From Your Boat Seats? - YouTube
Marine 31 Mildew Stain Remover Gel Gallon & 20 oz.
How to clean mildew off your boat seats | Fibrenew International