I seriously think it depends on where you live, as here in mornington I repeatedly see BMW's HSV's Porsche Boats etc etc all get cleaned at our local Super Sud's, Yes with high pressure water/soap and the brush's, that are actually soft, NOT BROOM Like at all.... maybe you need to choose which car wash you use..........
I care about my car, and my Boat has never shown any kind of wear from using this equipment, My 2 Cents