Here's my $.03.................I basically do the same as Randog. I wipe it all down (Top, bottom, and underneath) with a damp towel or I use window cleaner without alcohol. I hit the car with compressed air, including the engine. Then I vacum out the seats. Once that's done, I use a liquid wax and wax the frame, and side panels. I use aluminum polish on the wheels, beam, and anything else that is chrome. I have an open trailer, so it does get dirty from the drive in. But then I hit it with compressed air and a damp cloth and it's good as new. Along with my usual maintenance of my car it sounds like a lot, but what can I say, I love the hobby so I gladly do it so I can enjoy, and look half decent doing it................