Try what it says on the back of the package. Soaking the whistle in a water viniger solution. I do this between 1 every month or twice a month, depending on how sick i was, and how much crap i've coughed into the whistle. It really cleans out the inside. Let is soak overnight, then rinse it out, because i'm pretty sure no one likes the taste of viniger in their mouth for an hour and a half game.
And you've got another satisfied CMG user here.
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