Citrus Extract formula emulsifies oil, grease, gasoline, diesel fuel and transmission fluid. 2006 #1 Rated Bildge Cleaner by "Practical Sailor" 2006 #1 Rated By "Power Boat Reports". Pour in, run boat, drain. Biodegradable, Leaves a fresh citrus smell. 32 oz bottle will treat up to a 25' boat. See the 1 gallon container for ongoing maintenance!