Probably best to wash it in Dawn detergent, then give it a wipe down with a 50/50 mix of alcohol and water. Just mix the alcohol/water solution in a spray bottle, then use it like a quick detailer. Spray it on, then wipe it off with a microfiber towel. This should remove most all the wax from the paint. But like CJ said, paint is micro porous, it's gonna be extremely hard to remove all traces of wax.
Hopefully they baked it after they finished painting. This will help with the sealing process, but I'd still stay away from wax for a while, just to be safe.