Car wash options

Well I have been having to stay late at work this week and I have not been able to get to finishing up polishing my car before applying Gyeon Mohs. Since I do get some garage dust that makes it way to the paint when my car sits in the garage. I should be able to finish up the panels I did not do on friday. What is a good car wash soap that I can foam the car with and wash all the dust off that won't have any affect on the surface to be prepped for the coating.