ZING 10118 Marine Safe Boat Hull Cleaner - 1 GallonZING Marine Safe Boat Hull Cleaner safely removes marine deposits, scum, oxidation and algae. Non-fuming, easy to apply and use. Removes stains and discoloration on boat hulls. Ideal for fiberglass, painted wood, metal hulls, exposed power drives and propellers. Effective on boats used in both fres..