Spent a couple of hours working on the roof today. Washed with dish soap to remove the wax that was on it. Then used MacGuire's Clay Bar with the detailing spray. Followed that up with the cleaning polish that came with the clay bar kit. Followed that with MacGuire's NTX Tech Wax 2.0. Although it was a major improvement, it's to the point of having to be redone.
On the upside, I can't wait to do the rest of the truck with this system!!