Originally Posted by
Frizzle Fry
Best cure it to polish it and ANODIZE.
Anodizing and other forms of browning, case hardening, electroplating, etc. are meant more to protect than to look pretty. Ever notice how aluminum eventually discolors and goes opaque or gets black/grey shadowy look after being polished? That's a result of oxidization, which if left unchecked can lead to pitting (or with pieces of cast aluminum rather than pieces milled from a billet, flaking). The sooner you get it covered, the better - a good anodizer can polish it and do a clear shiny silver for you if that's the look you want.
The other option is to clean and polish it all the time, but eventually you will take off too much material and the tolerances will be too far off to function properly.