K&N Recharger Air Filter Cleaning Kit K&N Recharger Kit is designed for cleaning your K&N oiled cotton air filter when it is time to be serviced. The kit comes with K&N Power Kleen air filter cleaner and air filter oil. It will restore air flow efficiency and will bring your K&N oiled cotton air filter to like new condition. K&N Power Kleen works to dissolve the dirt build up and old filter oil, and can be washed away with water. After the air filter fully dries re-oil your air filter and then reinstall it. Restores filter to like new condition. Removes road grime, engine exhaust and grease from K&N filters. The only cleaner designed specifically for K&N cotton filters. Fast and easy filter oil application. 204ml air filter oil spray. 355ml air filter cleaner Spray.