Automatic Bilge Cleaner Heavy duty, concentrated formula for the toughest jobs. Protects hull from costly deterioration. Dissolves, emulsifies and combines grease, oil and scum with bilge water. Automatically reaches the most difficult places with the roll of the boat. Kills bilge odor, saves scrubbing time. Biodegradable. Gallon jug. Note: Gallons do not qualify for free shipping.