Dissolves oil, grease, gasoline, diesel fuel, sludge. Just pour in bilge, run boat, drain. Biodegradable, environmentally-friendly formula cleans quickly and easily. Keeps the bilge free from oil, grease and slime buildup. Add about a quart and let it slosh around for a day, then pump it out. Leaves your bilge smelling fresh and clean. Self cleaning - Rolling action of boat washes bilge & emulsifies oil, grease, fuel, sludge etc. Helps protects against vapour explosions. Cleans sludge from bilge wells without scrubbing. Safe for fiberglass, wood and metal boats. A citrus-based cleaner formulated to be effective against a wide variety of soils and grease.