Air filter cleaner is for the use of foam filters. It disolves dirt and oil, for increased performance and better fuel efficiency. Once your air cleaner is clean, make sure to use Motorex air filter oil to prevent the penetration of dust, sand and water through your nice clean air filter. Great product and surely one of the simplest ways to get your scooter performing at its best is to clean the air filter. remember to impregnate the filter with air filter oil once its clean.