Not a thread in itself, but I talked about it in my Sierra thread. Heres the process I follow:
1 - Clean the hell out of them; I use some dawn to strip off any product
2 - Use sandpaper to scuff out any scratches or dings. Start at 400 and go up to 1000+ until the area affected can be polished
3 - I like to coat the wheels with a high grit polish by hand (just squirt some on the wheel and spread it around with your fingers/hand), then sprinkle some powder cleaner like 'barkeepers helper' on over the existing polish
4 - At a very very slow speed use a powerball or something similar and rub in the polish and powder, it will get messy, but its worth it. Keep at the slow speed until you've hit the entire wheel a few times. This procedure cleans the hell out of the bare metal and starts the polishing process
5 - Re-do step 4 as much as needed without the powder cleaner, stepping up the speed until you begin to get a bit of shine and all blemishes and water/dirt spots are gone
6 - Remove all product from steps 3-5, and hard polish the whole wheel by hand with the high grit polish
7 - Wipe all of the product off
8 - Get a no-grit polish and hit it with a high speed polisher or powerball/cone set to a higher speed and pressure. Repeat as needed.
9 - Polish out any remaining cloudy spots by hand with the no grit polish
10 - Clean off any remaining polish
11 - Use a new polishing pad (or towel) and lightly apply a good sealer
12 - Enjoy!
For the back of those wheels I would probably just use a scotch-brite pad to get all that junk off and start from scratch of the backs. All of those wheels need more polishing, you can get them perfect since theyre not scratched up. That bad wheel might just need some higher grit polish and more speed on the polisher. It takes hours per wheel if they are in terrible shape, but you can save them for sure. If needed, you can use a medium grit polish in between the high and no grit. If you maintain them by hitting them with a light no-grit polish and a good seal every time you wash the truck (or once a month) then a heavy polish will last well over a year. Don't worry about getting nice, expensive product - if the process is done correctly the results will be the same. I use your everyday Mothers polish and pads from Oreileys, and Costco microfiber towels. Let me know if you have any questions.