Most car dealerships (at least the volume ones) will have basically a "one stall" auto wash. Probably won't pull your car through like the large commercial ones, but it will likely have brushes, etc that do most of the work for them. Then they will half *** dry your car with the same cotton towels they've used on the three previous cars leaving an ever growing maze of spiderwebs.
A dealership wash is only a halfstep higher than a commercial robot wash. Don't do that.