So I'm working on this 51xxx conn soprano. For some reason the horn has a coat of clear lacquer over the silver plating. A lot of it has came off, but some didn't and I burnt it while trying to resolder a post. It turned yellow and then black once it touched the flame, which is weird by itself. I thought lacquer should have some basic heat resistance but apparently this one doesn't. Now there is a big patch of burnt lacquer on the horn and I can't get it off. The horn also has tiny spots of lacquer that can't be wiped off and makes the horn looks really bad on the outside. Any recommendations on ways to remove it or good chemical stripping material?