Originally Posted by faeriekitsune
When we used to polish silver plates and other decorative pieces, we used plain ol' Crest toothpaste. Just the normal white basic kind. Works decently on copper as well, although I haven't tried it on brass. Takes a little bit of elbow grease though...
you need to try the method with AL foil, hot water, and baking soda really easy, cheap as dirt and fast
for a walk through, theres a few variations of it but all are pretty much the same
i am not sure if this would work on copper but it might, try on scrap first