So I did an experiment for you. For science.

This guy posted on Reddit about how he hasn't used soap and shampoo for a year. I've heard similar ideas before, so I decided to give it a try.

For over a month, I showered only with water. I never stopped feeling unclean. My hair had lots of dandruff. My scalp itched. Scratching it felt tacky due to the oil on my hair. I cut my hair to 1/3 inch, and it wasn't much better. A month went by. No improvement.

I used soap & shampoo again today. I finally feel clean. My hair smells good. My scalp isn't itchy.

Maybe not using soap and shampoo works for people who shower 3 times a day and swim in chlorine regularly, but it didn't work for me.

So scratch that theory.