I think I was a dirty brat. During the elementary school days, I used to take a bath with a book in my hand. Often, I did not wash at all, and would get out of the bath where the only difference was that I have progressed with the reading of the book by several pages. My mother used to accuse me of "a crow's bathing", after a popular expression in Japan referring to a bath taking without the cleansing elements.
As a result, my hair would often get oily, as if a natural additive was applied to the head shrub. I was literally an oily boy.
Nowadays, I take shower and wash my hair every morning. And yet, I do not distinguish between soap and shampoo. Most often, I wash my hair with a bar of soap. The brat element has not left me.