chrismk,
He used a Flex polisher but you could use any rotorey sander (must have speed control or ally could get too hot), wet and dry paper on it , just cut it to fit sander head, Grade120,220,320,500,800,2000, then buff with felt pad and chrome cleaner/ metal polish,and then finish with a lambs wool bonet which you can attach to a drill.
Then he put on loads of WD/40 to repell any water and crap.
I will try to get a pic of the before and after.
If you need any other info give me a shout.