Motorex USA has a new powder foam air filter cleaner and air filter oil designed for offroad and racing conditions. Filters are cleaned in Motorex Racing Bio Dirt Remover after dissolving the powder in hot water and soaking the filter, followed by rinsing with cold water.
The dry filter is then immersed in Bio Liquid Power oil, then squeezed out. Motorex claims it’s effective in keeping sand, dust and water from entering the engine through the filter. Bio Dirt Remover, $19.95. Bio Liquid Power, $25.95.