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I don't have any links handy (posting from my iPhone) but there have been lots of people who tested this on various detailing forums and shown repeatedly that there was no difference in the water beading properties on cars before and after having been washed with dish soaps. Also, as C8N mentioned below, polishes and glazes (usually oil based, which carnuba wax is not) that were popular on single stage paints can be stripped by dish soap, but modern clear coats have basically no use for these products anymore.
It seems the general consensus is that this rumor started because people would wash their car with dish soap and not rinse properly (needs hot water). As a result, the dish soap leaves behind a film which can inhibit water beading, thus leading people to believe it had stripped the wax.
That last part is interesting and if true, then that's basically giving more reason you shouldn't use dish soap to wash a car. I mean, seriously, who is going to know to or want to use hot water to wash their car?
I'm sticking with my idea that dish soap shouldn't be used to wash cars.
That last part is interesting and if true, then that's basically giving more reason you shouldn't use dish soap to wash a car. I mean, seriously, who is going to know to or want to use hot water to wash their car?
I'm sticking with my idea that dish soap shouldn't be used to wash cars.
I agree on both counts, though to be fair there are lower grade car washes that can leave similar film.
Also, there are automotive soaps on the market that claim to be able to strip waxes (Iron-X Snow Foam and Chemical Guys Citrus Wash & Gloss to name a couple) at higher concentrations.
Hmmm ... ... ... my car is filthy ... FILTHY, I tell ya! She's a very sick, sweet ride, always garaged when she's not out for a spin with her "mama" (me) and she's black and in desperate need of a wash because she's all dusty. Say ... if ya don't mind, could ya get that OCD neighbor of yours to swing by my crib so he can wash and pamper my baby???
So does no one stop to think that maybe this guy takes pride in what he has worked to obtain? Maybe he takes a lot of pride in a home that he worked hard for. Same with the car. He wants it to look the best it can, so he is willing to put forth whatever effort is necessary to keep it at its best. Maybe it makes him happy and he has nothing else to do. I personally find cleaning vehicles to be therapeutic. If I've had a busy day at work I can come home, shut my brain off and clean my vehicles and not think about work.
I'm much the same way as this guy with my home and vehicles. My wife helps, but I clean most of our house. Not because she can't but because it's the nicest thing I've ever owned so I am constantly keeping it the way that makes me happy. If you don't find me cleaning in the house, I'm outside working in our yard (I even rake the grass clippings), our flowerbeds, or cleaning our vehicles. Homes and cars are expensive, so why not maintain them so they continue to look new for years to come?
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Say ... if ya don't mind, could ya get that OCD neighbor of yours to swing by my crib so he can wash and pamper my baby??? 
