So I'm going to be detailing a co-workers F-350 Dually next Tuesday. It's BIG and it's WHITE. I have a tube of Meguiars White Wax which I've had luck with before, but I've seen a lot of of good stuff with the 3D HD Speed. We working at a coal power plant so the truck is covered in industrial fallout. I'm going to Iron X it, but the white paint is faded and yellowing a bit. I'm looking to do a one-step correction using a AIO, so the question is go with the White Wax or HD Speed?