Another thing I do when washing a car is to power spray it down before touching it, to get the majority of dust off of it, and all of the big stuff. I don't mean a pressure washer, as I don't like the thought of that much pressure on dirt on the car. I just mean a standard pressure adjustable pressure nozzle on a hose.

I also stocked up on those Mr. Clean car wash kit refillables when they discontinued the product line. Water just runs off the car after I use the mist setting on it, very little need to dry before waxing it.