Greasy Valve Stem Felts
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PSA: If anybody is using WD-40, or any other kind of penetrating oil on their trumpet....STOP!!!
Please, clean your trumpet thoroughly with dish soap or simple green. Never, ever use these kinds of chemicals on a trumpet. There are more than enough chemicals designed to be used with brass instruments. Not only do these chemicals do weird things to the brass and valves, but they can seriously impact your health.