Try this out! Effortlessly removes built-up mineral deposits going on outdrives with thru-hull exhaust. What are you waiting for? Shop Now! Features: SKU: M00609 UPC: 058957006095 Weight: 10.00 LBS Size: Gallon Additional Features: Works for marine and RV fiberglass, metals, and anodes Removes chalking, algae, lime, scale, and oxidation Known as effective for wheels, tires, and rims Rinsed away, and guarantee it will leave your surface nice and clean 100% biodegradable formula, non-aerosol, ozone-safe Sold as a 1-gallon jug Made in the USA Hull cleaner which is perfect designed for marine fiberglass, metals and anodes Boat hull cleaning: eliminate scum line, algae, scale, chalking furthermore light oxidation like a fiberglass boat cleaner or on aluminum boat hulls as well remove yellowing, light oxidation and chalking from fiberglass RV exterior Note: Great designed for cleaning scum lines or algae off your boat hull. 100% biodegradable, non-aerosol. Dissolves and removes chalking, algae, rust, scale, lime, corrosion, soap scum, oxidation, yellow stains, and most water minerals from fiberglass. Easily removes built up mineral deposits on outdrives and thru-hull exhaust.