99-9000High performance cleaner and degreaserThe only cleaner designed specifically for K&N cotton filtersDissolves the dirt build up and old filter oilWashes away with waterK&N air filter cleaner is the only cleaner recommended to clean K&N cotton air filter elements. K&N Air Filter Cleaner works to dissolve dirt build up and old filter oil and can be washed away with water. It is environmentally friendly and safe on paint, chrome, cast aluminum, plastic, rubber and vinyl when used as directed (do not use on polished or anodized aluminum). Complete instructions on bottle.