After less than a year, all of the brushed aluminum on my bike looks like sheeeeeit. What do you fine people use for those naughty bits?
I used Mirka Mirlon 1500 grey ultra fine scotch-brite, it gives a finish that's close to the original although that really depends how straight you keep the lines, it would be difficult to blend a small area and not be noticeable, you really need to go all out and refinish the whole part if necessary (mine was 3 years old when I bought it).Nice work! What thickness/grit of Scotchbrite, and did you take the casings off to do it? I've touched my cases up a little bit (relatively new ride) with a medium grit; couple scratches likely from rocks or something needed addressing...
That's another option although you still have to take care of them being bare aluminium and they look great on your bike but wouldn't really suit my TTR as there are fewer chrome or shiny finishes.