Try this ->
http://store5.yimg.com/I/tolae_1761_3466190
http://www.topoftheline.com/onegranchrom.html
It works great on all aluminum/chromed surfaces.

or this ->
Meguiar’s "All Metal Polisher" prod. ID# M-2805
http://www.meguiars.com/
Use search to find details. This particular product works for me.