Yeah, dish soap will cut all the wax on the car right off. Some sources say that ph of the soap isn't too kind on the clearcoat either, but I'm not sure if I buy that. At any rate, if you are going to use dish soap, I'd rinse liberally and then wax it several times right after. It is something to consider if you got gunk embedded in your wax and you don't feel like using a claybar.

 

Ill have to look up claybar.

 

The key to a claybar is use lots of spary lubricant (which should come with the bar). Especially if you have never clayed a car or have ever seen it done before. If you think you are using too much... just remember you can't over do it (so spray away).