Well, for the outside of the Tips I used Happich Chrome polish that comes from Germany. I used a sock turned inside out and did the Ole' Shoe-shine style polishing.
On the inside it was a bit more difficult:

I had to first wet sand, with 800, then 1200. After I dried the area, I polished, with my 2 fingers, the inside. It took a good 3 hours to polish all 4 tips.
Now when I wash, i have a special mit that i used to wash inside the tips. Every 4or 6 washes I take a little Happich Chrome Polish and hit-Em!

Easy, Peasy.
I had my wheels done at Excaliber( Forgot how to spell it...) Metal Polishing. Don't go there, You will thank me later...
Sam