A friend of mine has been looking into an awning that can be retracted against the house when not in use. Like the ones they can install over a deck or patio.
I have used some of the no rinse, or "waterless" products, but in my thinking, there's no substitute for a traditional wash. Fender wells, wheels, etc. I know lots of folks have good results with these products, but I lay use them if absolutely necessary.
Of topic a bit, but my attached garage has all the washing equipment installed by the door. Light duty pressure washer with over 50' of hose on a reel and a water deionizer for spot free drying without towels.