THOSE LOOK DIRTY.
I have bunch of small bronze knobs that were turning green/rusting.
I wanted to use a natural product to remove the green areas, so first I tried vinegar with a small cloth. After rubbing them a bit, I saw the green coming off but it wasn't happening fast enough. Online I read that you can either use an acidic remover (vinegar in this case) or an all-purpose remover. So I got out my Krud Kutter, which is considered all-purpose, and decided it might help to use an old toothbrush, and voila!
My knobbies are nice and clean! Don't you love the different shapes and details on these? In some ways I liked the green because it showed the age of the knobs, but when there are patches of it here and there it just looked weird. Now they're ready to be used on furniture that I don't yet own. Yay! Until then they're a nice decoration.