Star brite Fuel Tank Cleaner is a powerful yet safe way to eliminate damaging sludge, gum and biomass from aged or contaminated fuel tanks. It cleans injectors, unclogs fuel lines and rejuvenates old gasoline and diesel fuel. Star brite Fuel Tank Cleaner does not contain any chemical strippers, alcohol or detergents and is safe for use in all engines. Corrosive organic sludge contaminants such as fungus, mold and asphaltenes are quickly broken down and dispersed. Heavier sludge components will be trapped in the fuel filters and removed. Note: Keep spare fuel filers on hand. Tank cleaner will disperse hardened deposits and can load (clog) filters. After two treatments, fuel tank should be cleaned of all deposits and fuel filters will no longer load (clog) up. Allow to sit in tank for a minimum of 24 hours before using rejuvenated fuel.