ok, what I'm about to post here is not bmx related, but I'm sure it'll help some of you who like chrome to get that mirror look by yourself in those aged and lost shine parts laying around waiting for your attention to build them in the splendor of the early days when they come out.
this web page describes a mod done to a computer case, see the progress of this project and take a close look at the finished piece shining like your home mirror!
the products he used to achieve that result are advertised in there, so check their site also because you'll find lots of info about polishing materials.
www.metku.net/