Musical instrument of the trombone family pitched in Bb with a telescopic slide with which the player varies the length of the tube to change the pitch.

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Bass trombone maintenance

I have just purchased a Jupiter 1240 L-T bass trombone which has Thayer Valves. I am wondering if: It is possible to wash the instrument in the bath tub (will the Thayer Valves be ruined?) Can I ...