Motorex Racing Bio Dirt Remover is a specially developed powder cleaner for off-road motorcycles and quads (ATV) which are fitted with reusable foam air filters. Its active ingredients dissolve even the most stubborn dirt. Developed by Motorex Racing Lab in close collaboration with Twin Air. Rapidly biodegradable. Removes even the most stubborn dirt quickly and completely. For reusable foam air filters. Fast and easy to use. Rinse under running water. Environmentally friendly.