Re: Tarnish Removal
What you are describing is often termed "red rot" and is a result of the zinc in the brass alloy leaching out to the surface. It really should be arrested asap to avoid it eventually eating all the way through (although spots hear and there would take a LONG time to do so).
Brasso, as Terry suggested, can be used as can another wonderful product called Hagerty's Metal Paste Polish. This is a non abrasive cleaner that will not scratch the surface, yet is effective in removing the offending red rot. You can find this in department stores that carry fine Silver and stores such as Linen & Things, Bed Bath and Beyond etc.
To avoid this reoccurring after removal, you should put a light coat of clear lacquer over the area to seal it from air and moisture. For small spots, clear nail polish will work in a pinch.
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