k&n 99-5000eu aerosol recharger air filter care service kit k&n k&n aerosol recharger air filter care service kit - 99-5000 k&n recharger kit contains k&n air filter cleaner and air filter oil. it is a six-step maintenance system designed to recharge any k&n filtercharger air filter. it is biodegradable and safe on paint, chrome, cast aluminum, plastic, rubber and vinyl when used as directed. each kit includes filter cleaner, an aerosol filter oil spray can or a squeeze oil bottle, and a service decal. complete instruction is included with this kit.