K&N Power Kleen™ is the only cleaner recommended to clean K&N Air Filter elements. The use of any other cleaning solution can void the filter’s warranty, and quite possibly could damage your engine and the filter’s cotton material. K&N Power Kleen™ works to dissolve dirt build up and old filter oil and can be washed away with water. It is now formulated to clean jobs around your garage as well. It is environmentally friendly and specially formulated to remove oil, lubricants, grease, grime, and other deposits from most surfaces including cotton air filters, painted surfaces, chrome, plastic and more!