I remember one sailor (Mike Golding) say that if you go without washing your hair for a few days it restores all the natural oils that shampoo "destroys".
I didn't wash my hair for a week once. I rinsed, but used no soap to test that theory. I didn't like the result. It felt gross, but I'm also OCD type that washes his hands all the time, and showers at least once a day.
