I try to stay away from a pressure washer because under high pressure, water can get past your seals if you hit them right with the pressure washer. I just use a car wash attachment on my hose... you know the kind that you soap and rinse with. I spray down and break the mud loose and then use Simple Green, rinse, dry and then run the motor a bit and go up and down the block just to put heat in the brakes. Wipe any water off that running down the block has shaken loose, then just Armoral and re-lube the chain if needed. Then I re-fill my gas. If you leave your tank half full for long periods, the air in there does contain moisture and that moisture can condense out into your fuel over time. Leave your tank half full ride after ride and the amount of water can build up more and more. Water in fuel = not good. Tank full = no air, no air = no moisture.