Start with a compressor and blow any lose dust off, motor, esc and servo and inside wheels included. Then and hard stuff i take a wettened toothbrush and knock it off and then take a towel wipe off any stubborn dust and bits. If covered heavly in mud i pull wheels and tires and put the nose or the back end in a wash sink , i got the hose attached to it and low pressure and warm water and just gently rinse off any mud.