K&N 99-0624 is a 32 ounce spray bottle of K&N Synthetic Air Filter Cleaner. The 99-0624 air filter cleaner will bring your K&N synthetic air filter to like new condition. It works to dissolve grime and dirt build up, then it can be washed away with water. It is a great cleaner for K&N Hybrid air filters, K&N Blackhawk air filters, Dryflow air filters and other synthetic air filters.