This is a REALLY good question. Through out the show this weekend, I have had folks come up, grab a call and blow it, then set it down and get another and so on. What we have been doing is dipping and them wiping them off with mint Listerine. Hade one feller, say "Hey, do you think I got germs???" My wife answered him, "No but the guy right before you did". ;) The mouth wash works real good. Or friend is a nurse and my daughter in law was in carge of sterilization at the hospital she worked in. They both recommended it for the calls. Besides, it leaves them "Minty Fresh too" :D