This was a surprising tip I found to clean those brass pieces and fixtures that look so neglected... Ketchup! Apparently the acid in the tomatoes cuts right through that natural oxidation of your precious brass pieces. Check out the before, middle and after below:
The above photo is what the piece appeared before applying this household staple. Below is the surprising progress we have made:
This trick will work on any of your brass fixtures; however, we strongly urge you to allow those antique pieces to continue to patina as it increases the value to allow the natural oxidation of the metal.