I use Meguiar's Gold Class paste wax or High Tech yellow paste wax or with an orbital buffer I got from Sears. A couple of times a year, I use a clay bar first to get some of the grit off the surface, followed by their Deep Crystal Polish, then use the paste wax. I do not use a cleaner wax.

Some of the folks on this boar won't use wax at all. They swear by polish alone. I don't go to that school, but I don't begrudge them their way of doing things. Whatever works.