What is the "clean hand, dirty hand" technique?

What is the "clean hand, dirty hand" technique?

CIDD's Dr. Beth McGraw explains the concept of "clean hand, dirty hand," a useful tactic that can help you keep potential contaminants away from your clean personal areas. To see more coronavirus questions answered by experts at the Center for Infectious Disease Dynamics, submit a question of your own, or learn how you can do your part to #flattenthecurve, visit http://askcidd.psu.edu