If I had a nice, new vehicle in a dark color, I'd likely not use the automatic carwashes much, unless they were the "touch-less" variety that only uses spray nozzles. If it's a light-colored vehicle, I don't fret it being a carwash with the spinning brushes/mops. Run it through once a week or every other. But I will say this is for typical road grime, as I'd not put a muddy truck through a brush/mop carwash. Power wash that stuff off first.
