Happy to hear it got better after the flossing Rhadge.
Now if it were spit, you’d expect the same amount of drool when playing a whistle with a plastic mouthpiece (Gen type). But you don’t, a whistle with a metal mouthpiece cloggs much easier. I’d say it’s condensation.
Of course there could be some spit involved. Tho likely limited to those who spit alot when they talk, as they should also spit alot when they play the whistle… 