Clean your Bio Liquid Power-oiled filter with Bio Dirt Remover! Whether using a washing machine or hand washing your filter in a bucket, this granular, water-soluble cleaner can go right down the drain without clogging it up or harming the delicate environment. And, unlike solvents or gas, Bio Cleaner will not harden or damage the filter foam. It is the first line of defense toward keeping your Twin Air or O.E.M. foam filter in top condition. Washes air filters clean with warm water. Will not damage or weaken the filter foam; safe for all foam filters. Solvent free. Biodegradable and non-combustible. Environment friendly. May be used in hand-pump spray bottles. 1 liter.