Dish soap will strip the wax off your car but its not "bad". There are rumours of it drying out your paint over time but periodic use is fine. I use it before I wax my car. Normal car wash soap first to lift the dirt and prevent scratching then dish soap to get the wax and more stuborn stuff off.
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'09 370Z - '93 300ZX Vert - '83 280ZX - '83 280ZXT -'81 280ZXT stroker - '72 240Z - Stillen CBE, HFC, G3, Grounding Kit, Sways // Swift Spring // H&R 15mm // 5% Tint // Clear Bra // 
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