EZ-ON EZ-Off Hull & Bottom Cleaner is the best and easiest way to clean dirty bottoms and hulls. Loosens tough marine deposits, and removes stubborn stains quickly and without hard scrubbing. Ideal for cleaning baitwells, fish boxes or in-deck storage., Removes deposits on boat bottoms, scum line and rust stains quickly and easily.Loosens the toughest deposits on boat bottoms, removes scum lines and rust stains.Water based, environmentally friendly formula.