PJ1 Air Filter Cleaner quickly dissolves dirt, grease, and grime with a simple spray on, wash off process. Eliminates soaking and rinsing dirty filters in gasoline & other solvents. PJ1 Air Filter Cleaner works with both fabric and foam filters without harming filter glues. Spray on, wait 15 minutes, wash off with water. Completely cleans filter with no additional washing afterwards. Wont harm filter elements. Helps extends life of filter.