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I used to use dish soap for washing my cars, and felt that the horror expressed by the car cleaning products people over this practice was a lot of self-serving BS. My cynical side still tends to look with a good deal of suspicion at a lot their claims, but I no longer think this is one of them.
I have had several cars washed only with dish soap and I can say without exception the paint looked like crap after about seven or eight years. Dull, and almost impossible to bring back with cleaning and waxing. At the time I put it down to just age and sitting outside, but experience with car washing soaps has convinced me that a good deal of the problem was probably the dish soap.
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