Maxima Oils' Air Filter Maintenance Combo Kit includes two aerosol cans, one Air Filter Cleaner and one Fab-1 Spray On Air Filter Oil. The Air Filter Cleaner is a emulsion-type of cleaner that had been designed to be strong enough to thoroughly clean filters by removing the oil and dirt without damaging paper, glue, or the foam material itself. To make cleaning even easier, Maxima's cleaning solution is water soluble so a good rinse with water will flush the cleaner from the filter material! Fab-1 synthetic air filter oil is easily applied by spraying the filter surface and allowing some time to soak. Fab-1 synthetic oil is water resistant and catches fine dust particles without restricting airflow.