Most vehicles have been waxed at some point in their life. Wax protects the surface of the paint. It is a replaceable wear layer of sorts. It helps bugs, tar, tree sap, ect come off the surface without bonding to the paint and causing damage.
Wax also helps seal small imperfections in the paint, and water proof the surface. In winter here, the wax is the front line of protection against the salt and expansion / contraction of water in the small crevices. With out the wax, The body of a car can go down hill fast.
Dish soap removes all this protective coating, and should not be used to wash vehicles.
"Don't argue with stupid people. They will just drag you down to their level, and beat you up with experience."
Patently waiting for the apocalypses to level the playing field in this physiological game of life commonly known as Civilization