Alcohol has been used for centuries to ease one's whoes. One of my whoes was that I had a valve or two dragging on a couple of my horns. This was after a through cleaning of the horn, and using vinegar on the valves, once. Recently I gave my horns a lovely soapy bath, and rinsed them throughly while my valves were bathing in a glass of 70% Isopropyl rubbing Alcohol. When fininshed, I rinsed everything THROUGHLY! Then I dried everything with a hair dryer, THROUGHLY, not on hot. After greasing slides and re-assemling the horn, I put a coating of Ultra-Pure valve oil on the valves, spun them once or twice in the valve cassing, screwed them down, never touching the lower section of the valves, and Eureka!, no more dragging! Veterans, is this good advise to pass on, or did I just luck out?