Here are my thoughts after trying many different products these are my favorites.
For cleaning the tire nothing is better than "Westley's Bleche-Wite":
http://westleys.com/internal_pages/Bleche-White.htm
For the rims my favorite stuff is "Eagle One A2Z All Wheel & Tire Cleaner":
http://www.eagleone.com/_products/0,1020626.asp