check out eastwood company in pottstown ,PA
they have alot of polishing equipment and materials the best thing to do
is get as clean mechanically as you can then do the final polishing by
hand ,for something that small it will only take a few minutes to do it
and it will look like a mirror ,and also check out to see what your
local fire department uses on their firetrucks to polish the different
aluminum and brass components and also try a polish I use called MAAS
it works wonders it makes everything from chrome aluminum brass and
copper look better than new ,you can usually find it in walmart back by
the household cleaners ,and as soon as you use it you will see the
results