If the car is clean and debris free, I cant see it doing any harm.
I'm not a fan of the "waterless" wash systems as they mask the minute scratches they leave with "fillers". These dont last long, wash off and then the paintwork looks dull, full of "cobwebs" and bad hazing.
IMO there is no subsitute for a good 2 bucket method washing routine, (or a Gilmour Foamaster), proper dry, then topped up with a decent wax or LSP.