Orpine Bilge Cleaner Highly concentrated, heavy duty bilge cleaner dissolves oil and grime. Removes musty, mildew odors from bilge and boat. Biodegradable.Dissolves with the rocking motion of vessels in the water and mixes with dirty bilge water to tie up oil, grease and dirt. Will not harm bilge pumps or float switches. May also be used as a degreaser. Gallon jug. Note: Gallons do not qualify for free shipping.