Hair

Hi
I heard that if you stop washing your hair it would normalize and start to selfclean after about six weeks. If this is true, it would be possible to avoid many chemicals that are bad for both humans and nature. I read up on castile soap but a pH of 9 seems to be too harsh for hair. I wash my face with almond oil. This makes wonder. What is your opinion on this?
Many thanks Ullbjorn Tweet