I took an orbital buffer to the clear coat haze that I had growing on the paint in a couple spots as well as the entire truck using a light abrasive rubbing compound with no fillers. It took the haze off the bumper completely, all the spider webbing and wipe marks from washing were rubbed off. The fender haze came off too.
I'd like to pull up the plastic grate on top of the rear bumper and hit the top corners better because its hard to get the buffer up against the plastic with the 90 deg.. I'm afraid of breaking it or bending it lol. The whole truck shines like a diamond now with a filler, polish and UV protestant.