before you get grossed out and liken me to pigpen from charlie brown...
most big brand shampoos have harmful chemicals that dry out your hair and scalp, then coat your hairs in silicone which is really not good. I got off shampoo a month ago, and my hair is almost never oily, never smells, and always looks really nice and not poofy.
I also only wash my hair every three or four days. with water only.
Yeah this sounds pretty gross looking back at it. I swear it's not.