My old alto has some areas (mostly at the edge of the neck, and slightly inside) where the brass has developed some sort of corrosion. It's a bright green-blue color. My guess is that the copper in the brass has corroded, but I'm not sure.
Does anyone know how I can properly clean this stuff off? Is there some sort of brass polish that can be used? I don't want to damage the sax.
Also, is this something that's common for saxophones? I looked at a new alto in a music store the other day, and it seemed to have a bit of the stuff forming at the edge of the neck, where the lacquer stopped.