Dave Witlock is a practical man. “I have not taken a shower in over 12 years. No one did clinical trials on people taking showers every day. So what’s the basis for assuming that that is a healthy practice?”

Twice a day, Mr. Witlock applies a live bacteria solution of his own design to his skin. To spread the bacteria to everyone else, he has founded a company called AOBiome and is selling a spray that contains live ammonia oxidizing bacteria (AOB), called Mother Dirt.

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