For many people, a soothing shower is one of life's luxuries - but not Dave Whitlock, who hasn't showered in 12 years.
The chemical engineer and MIT graduate wants to preserve the bacteria on his skin - so rather than showering he sprays on Mother Dirt, a mist containing live bacteria, twice a day.
The mist is manufactured by AOBiome, a company Mr Whitlock helped found.
“I have not taken a shower in over 12 years,” Mr Whitlock said.
“No one did clinical trials on people taking showers every day.
"So what’s the basis for assuming that that is a healthy practice.”
Mother Dirt has no odour and feels like water.
On it's website, the company says it researches probiotics for the skin.
"We've developed a live probiotic, AO+ Mist, which contains the good bacteria, AOB. This soil bacteria is the best probiotic for your skin.
"Many users find they can start reducing showers or incorporate a no soap or reduced soap hygiene routine.
AOBiome's consumer products general manager Jasmina Aganovic said "we've confused clean with sterile", The Daily Mail reported.
"We've taken the dirt out of our lives. We don't spend as much time outdoors as we used to, even little children."
Morning news break – September 7