**Don't use Dawn or other liquid detergents on your paint!**
True, it will remove all traces of wax, but you can buy a Stage 1 cleaner (Mother's Stage 1 Paint Cleaner) that will remove all old wax and oxidation without removing essential oils and other desirable chemicals in the paint (especially brand new paint!). Sure it's a little more involved, but your car will thank in you a couple of years...