I believe that the dirtier the hair, the better. For me, a fresh blow out is at it's best on the 2nd day. A serious concern I have with shampooing is that there a million different types of shampoo's out there yet, all of them strip the hair and most of them are full of ingredients that are harmful to our bodies. I have noticed more and more women, myself included are thinning, more so than say, 15 years ago. Have you taken a look at what is in your shampoo bottle? Do you know what those ingredients are and where they came from? I invite you to take a wee look and ask yourself, " do I want to be applying these toxins to my hair and body?"