Really got to say that I would never put my mustang through an automatic car wash. I enjoy cleaning her by hand too much.
What about the long wet cold winters here in the great NW? It's often too darn cold to wash your own car.
2011 GT Coupe - candy red, auto, all the options
Mods - Roush supercharger, FRPP Sport axle-back mufflers, Forgestar CF5 gloss black staggered wheels