Tusk First Line Foam Air Filter Cleaner 15.5 oz is a foam air filter cleaning solution formulated to remove old filter oils and soil from foam air elements. This cleaning aerosol can be sprayed directly onto the filter or used by immersing the filter in the solution. After application, gently massage the foam to work the cleaner through, and then rinse with water to wash out contaminants. Designed to work with all foam air filters, this cleaner helps ensure the foam is ready for proper re-oiling and reuse.