Most of the time all it takes is a little friendly reminder. Right? So, let’s say it, hope it sinks in and then move on:
Sometimes the most basic of basic skills can be forgotten. You say the quickest way to get the job done is to stick all 10 fingers and thumbs in the mouths of those 10 or so dirty glasses? Unfortunately, your hands are now contaminated. And now you have to wash your hands. You blew your nose in between cocktail orders? Wash your hands.