I found that MAAS can be applied many times and each time delivers a better finish. It may require a few passes to get rid of the thin oxide that was formed upon the surface of the steel. Myself, I love it!

I often use a copper/brass polish to get the surface clean and uniform to start with. They have a pumice grit that does not scratch in them. Considering the smell and they way the clean oxide off brass and copper they may have acetic acid also.
~Richard