Car wash soap will not strip wax/polish. Dish soap will strip wax/polish and all the dirt and grease off for a clean start. I even use it when I detail a car that is nasty. Dawn gives you a clean naked base surface to start a good shine with. It will not hurt the paint, it just strips off all protectants (wax/polish) Think about it, if you car soak your hands in it for an hour as you do dishes, how will it hurt paint?
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03 GT, STB, GM HD sway bars, 35% tint, GE893(37watt)fogs, Flowtech Terminators, 180 T-stat, ZZP DP & PCM, Ceramic PLOG & Crossover, 18" glasspack, 2007 17" Mustang Bullits 235/55/17 Pirelli PZero Nero, 12" R1 D\S rotors, gutted air box, GTP radiator