The K&N 99-5050 Recharger Kit is designed to clean the K&N oiled cotton air filter when it’s time for maintenance. The kit includes K&N’s Power Kleen air filter cleaner and K&N air filter oil. The 99-5050 will restore airflow efficiency and leave your K&N oiled cotton air filter like new. K&N’s Power Kleen works to dissolve dirt buildup and old filter oil, which can then be washed away with water. Once the air filter is completely dry, re-oil it and reinstall. This recharger kit includes an 8-ounce squeeze bottle of oil and a 12-ounce pump bottle of K&N’s Power Kleen air filter cleaner.