Star brite E-Z On E-Z Off Boat Bottom Hull Cleaner, 32 oz The best, most effective hull & bottom cleaner you can buy Loosens the toughest deposits on boat bottoms, removes scum lines and rust stains Uses special patented buffered acids that make it safer to use than other harsh acid-based bottom cleaners Ideal for cleaning in-deck fish boxes and storage areas This item is not for sale in Catalina Island