Get some "Blue Magic" (aluminum wheel polish) sold at most auto stores. Follow the directions, once you wipe on the Blue Magic, the blue will turn into a black film. Now, before wiping it clean like it says to do, sprinkle some corn starch or flour on the wheels. Yep, cooking corn starch/flour (although the corn starch works slightly better). Now wipe the wheels clean with a clean soft cloth to a polish. Really makes a huge difference from using just the product alone. I've only used Blue Magic but it should work with similar aluminum wheel polishing products. If you don't believe, try doing the front without the corn starch and the back with the corn starch (on the same side of the truck). You should see an obvious difference. I use this on my Weld's and it works great. Do this and apply a car wax coat to the wheels to protect from some basic dirt and grime. It will reduce the number of times you need to polish them.
Dan