Use either the yellow pad or go to the Megguires Maroon pad using the Black fire compound. I had to step it up a bit on this car. The orange pad was not getting it done and I do not have the yellows. Its clean but seen quite a few auto car washes and likely never been hand washed, waxed and certainly not buffed. I ended up using the coarser Megguires Maroon with the Porter Cable 7424XP set at full speed (dial at 6 max) and had to make six passes (3 vertical overlapping and 3 horizontal overlapping) per area to get close to what I was hoping for. The random orbitals will stall before they burn the paint.
The roof, trunk, and rear spoiler are done and took about 2.5 hours. Still need to clean again and then wax after the buffing is all done. Don't get in a rush.
BEFORE:
AFTER:
SIDE BY SIDE BEFORE AFTER: