The powerful cleaner spray will quickly strip away the grease and dirt, yet won't damage the air filter element. The powerful cleaner spray will quickly strip away the grease and dirt, yet won't damage the air filter element. For Foam Air FIlter Elements only. Just spray it on, let it soak and rinse off with regular tap water. Air dry and then use the spray on filter oil to recharge the filter. Simple and easy. This two piece kit includes aerosol cleaner and spray oil.