If used in dry and or dusty condition I used to just sweep the dirt off with a brush and maybe take the wheels off and wash with water. If you hose your car you must remember to oil the bearings or they will go rusty. Most of the time a brushing is good enough. If driven in the wet, then brush and maybe towel dry. The wheels will definately need a wash. Take them off before washing though. I was/am too lazy to do more though.