K&N 99-0638 is a 1 US gallon container of K&N Heavy Duty Air Filter Cleaner. It is the only cleaner recommended for cleaning heavy duty commercial grade air filters. This cleaner can be used to clean K&N heavy duty air filters for large turbo diesel engines, class 6-8 over-the-road trucks, agricultural and earth moving equipment, and diesel motor homes. The 99-0638 air filter cleaner will bring your K&N heavy duty air filter to like new condition. It works to dissolve dirt and grime caught by the hybrid filter material and, then it can be rinsed out with a hose or pressure washer.

K&N Engineering in Riverside California is the world's leading manufacturer of washable performance air filters and air intake systems. K&N invented the reusable high flow cotton air filter in 1969 and has been perfecting the technology ever since. K&N is a world class filtration company selling air filters, oil filters, and air intakes in over 30 countries. K&N sells over 5,000 products designed for cars, trucks, motorcycles, engines, and industrial applications. From their Million Mile Warranty to their Consumer Protection Pledge, K&N stands behind their products and their consumers 100%. The distinctive K&N logo represents performance from one of the original performance companies.