I try to never use a whistle 2 games in a row without cleaning it well...I put them in the dishwasher then soak in listerine or some such (never thought of peroxide). I also switch whistles after the first if I work a 2 game set.
And I never, ever (ever) take a whistle from someone else. If I lend my whistle to someone else they get to keep it.
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