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I just use a liquid dish soap( just make sure it has no bleach in it, it reacts with the ammonia). The one I used called for,Ammonia,soft soap water and vegetable oil. Just mix it up and let it set over night I put more ammonia in it and it worked pretty good. I have also used toilet bowl cleaner on brass. It works realy fast. Thats what I use to clean fan blades for vintage fans. They polish very nice.