Starbrite Heavy Duty Bilge CleanerStarbrite Heavy Duty Bilge Cleaner is a easy-to-use, biodegradable cleaner that leaves boat bilges clean and odor free. This cleaner disperses and loosens sludge and grime in the bilge so that is can be pumped out. When using Starbrite Bilge Cleaner, make sure to drain or pump out your bilge in accordance with local regulations. Available in 32 oz and gallon sizes. The 32 oz bottle cleans up to 25' boat length and the gallon cleans up to 100' boat length.Features: Biodegradable; Easy to use; Phosphate free; Dissolves and eliminates oil, grease, fuel, scum, and sludge; Will not harm fiberglass, rubber hoses, wiring, metal or plastic; How to Use Starbrite Heavy Duty Bilge Cleaner: Pour entire contents of bottle into bilge. ; Use one bottle for every 25' of boat length. ; If bilge is dry, add several gallons of water. ; Allow bilge cleaner to remain in bilge while running boat for a minimum of one hour.; After running boat, drain or pump out bilge in accordance with local regulations.; Repeat once a month or as often as necessary to keep bilge clean and free of odors. ;