I'm curious how this works for people with long hair. To a certain extent, shampooing less can be great for your hair, for a lot of the reasons discussed in the article about skin care. Sulphates strip out your natural hair oils and do a bunch of bad things, so sulphate-free shampoos are a lot better. Additionally, once you get your scalp accustomed to less frequent shampooing and it stops producing tons of oil to compensate, life for your hair can be pretty good.

That said, I can never seem to get onto a cycle of more than just a couple days without shampooing before my hair is just too oily. Washing with just water isn't super sufficient either when you have long, thick hair.