Its hard to say with actually seeing the spots
The way that works best for me is: high-speed buffer
open cell foam pad -- heavy/medium polish
closed cell foam pad -- fine polish
*closed cell foam pad -- glaze* - not every time
orbital buffer to apply paint protection
More info check out . . .
http://www.topoftheline.com/waterspots.html
Also a product that works very well on black
http://www.topoftheline.com/32ozmidswirr.html
Web site for the Midnight Express with methods of use
http://www.hitempinc.com/HT-421.html