Looking for advice. My Bach is getting old, purchased in 1978. And my valves are getting really sticky. I've never had this problem before. My questions are, can my horn be saved, is it worth saving? Should I pay to have my valves realigned? I'm wondering if it's just some kind of build up. What is the best way to clean valves. Oh, and yes, to all the smart aleks out there, I've tried putting some valve oil on them.