Panic-buying over corona virus has depleted hand sanitizer supplies, and with cold and flu season still upon us, sanitizer and its ingredients are becoming difficult to find. Professor Davis explains why rubbing alcohol is the crucial ingredient in home-made hand sanitizers and what you can substitute in a pinch to make your own if rubbing alcohol is unavailable. Subscribe and hit the notification bell to get updates, including videos on how he reverse-engineered this hand sanitizer recipe in the lab.