In May, as the first heat of summer was coming on, I decided to stop bathing. I ditched my soap and shampoo. Instead of scrubbing down in the shower each morning or after a sweaty bike ride, I spritzed myself with “live probiotic spray for the skin,” a dose of bacteria that’s supposed to feed on the ammonia in sweat and neutralize the smell. I got rid of my deodorant, too. It was an interesting couple of weeks.