I haven't noticed the touch-free washes ruining my wax jobs, but then again, I wax often. I say hand wash whenever possible, but the nice thing about touch-free washes is this, when you buy the best one, it usually has an underbody wash to gets alot of the crud out from the bottom of the car. In addition to that there's the wax that smells like bubble gum, at least that's what my kids call it.