RC Tech ‘Air Filter Cleaner’ is used after driving to get rid of your filter oil with ‘RC Tech Air Filter Oil’. Instructions: pour a small quantity of the cleaner in a container. Immerse the filter or foam to be cleaned in the cleaner. If possible let soak for afew seconds. With wire filters we recommend to carefully clean the filter on te outside with a soft brush. When extremely filthy also rinseout the inside with cleaner. With foam filters immerse and gently rubout dirt.