I just bought a 90-year old sax, pads are in pretty good shape, but it's grubby. Brown, fossilized goo inside the toneholes, and the whole thing stinks. Is there a way to clean it without taking all of the keys off? Does anybody have experience with this kind of thing, or pointers? I'm not really qualified to totally disassemble it, and I don't really want to take it to my tech guy and make him deal with this nastiness, and I don't particularly want to destroy pretty good pads with cleaning agents, so if anyone has good ideas on the matter, I'd appreciate it! Thank you!