I have apolished Ti frame and I use Mothers aluminum polish and Nevrdull to keep my frame looking like chrome. The Mothers is a little more agressive/abrasive than the Nevrdull. I start with Mothers and finish with Neverdull. Purchasing the two will run you about ten bucks. Check it out, the finished product is very nice if you're after polished Ti.

http://forums.mtbr.com/showthread.ph...19696#poststop