Ah, yes, also clean inside the little tubes where the plungers go. True, the school might not provide the music room with a sink and hot water, and the teacher might not want to go find a sink.
Christopher A. Young Learn more about Jesus
Maybe not, you left out cleaning the valve cylinders. Usually best accomplish in a sink full of soapy water. There is a good change the teacher doesn't have the facilities to clean it properly.
Jimmie