POWER KLEEN filter cleaner is a powerful, highly effective degreaser that quickly dissolves filter build-up and old oil, allowing filter grime to be rinsed away with water. POWER KLEEN is the only product recommended to clean K&N cotton media filters—the use of any other cleaning solution can void the filter's warranty, and can potentially cause damage to the filtration material. Never use gasoline to clean your cotton media filter, as it can cause the filter media to degrade. Do not use on polished or anodized aluminum.