How do you remove the lacquer from a saxophone?
If someone has applied a lacquer to stop the brass from tarnishing,it’s likely that they have used either acrylic or oil based clear from an aerosol can.(some of the acrylics are of good quality) You should be able to remove it with acetone and clean cotton rags.If a 2-part polyurathane is on it, it will need paint stripper, but this is unlikely.