K&N Air Filter Cleaning Kits were created to ensure your K&N filter is performing at its best. While protecting and enhancing your engine's performance, the K&N air filter traps loads of dust, dirt and debris in its cotton-gauze filter medium. Your filter should be cleaned between 30,000 and 50,000 miles under normal driving conditions. After the filter has been swabbed, simply add the oil and you're ready to roll. And, you can choose either an aerosol spray can or a squeezable bottle to apply the oil. The K&N Air Filter Cleaning Kits will yield roughly 7 thorough cleanings or about 350,000 miles of top-performance filtration. Keep the clean air flowing and your engine going with the K&N Filter Cleaning Kit.