Are hand dryers in public restrooms more sanitary than paper towels? A new study says they’re not. In fact, the study found that they spray particles of poop all over you. What happens is is this. As the dryers suck up air from around them, including particles of poop from lidless toilets, they fire the airborne feces onto your wet hands. I’ll stick to my tried and true method of drying hands; wipe them my pants.