Duragloss 542 Marine and RV Cleaner removes stains and mildew, one gallon Professional strength marine and RV cleaner removes mildew and stains instantly Specially formulated blend of surfactants that penetrate and emulsify to make short work of mildew and stubborn stains on vinyl, fiberglass, tiles and other non-porous surfaces on the boat or RV Works great inside and outside of the boat or RV Work in a ventilated area Revives mildew-stained surfaces and makes them look new again