I don't know if anyone has tried this ye tor not but....(Don't laugh)
Mr. Clean Car washing kit. It has a hose attachment that sprays, then soaps, and finish by passing the h2o through an on board water softener to get a spot free rinse without drying! I got it for Christmas, and felt I should at least try it to be nice. I am glad I did! Water around here is soo hard! Even when you dry after washing if it even starts to dry before the towel dry your screwed!
I'm sure I'll get a few laughs for this suggestion but it really does work great! I don't use the brush attachment, Just rinse, soap, hand wash, rinse, then spot free rinse.