I'd go with a Mequiar's 3 step system. Check out their site
Meguiars and also check out their
forums. With this system, it'll take time, but you'll start by removing oxidation and all other contaminants with the cleaner, then a deep polish, then a good wax to protect it and make it shiny. I'd also do a claybar before all of this to remove even more of the contaminants and oxidation that cause your paint to become faded.
Also check out these helpful sites:
Car Care
autopia 
