K&N Recharger Air Filter Cleaning Kit Designed for revitalizing K&N air filters, this maintenance system efficiently restores air flow, ensuring the filter operates at its best. Features: Six-step maintenance system designed to recharge and clean any K&N air filter Kit contains one 12 oz bottle of K&N air filter cleaner and one 8 oz bottle of air filter oil Restores air flow efficiency so your K&N air filter performs like new!