Hi all. Maybe I've done something stupid. I had my trumpet in a vinegar bath to get rid of the scale but maybe the mix between water and vingar was a little too strong But now the scale is gone. But my valves has begun to get sticky Does anyone have an advices? I've heard something about putting my valves in milk? Ideas? Oh by the way my trumpet is a Bach strad 37 from 1993 so i don't think that is the problem.