My hair/scalp was literally screwed from the chemicals in shampoos. I could wash and condition it and when it dried my hair frizzed out and my scalp had what looked like cradle cap (and I'm 30!).
My hair is down to my waist and very thick. It's been a little less than a month with using just baking soda and apple cider vinegar twice a week and I love it. My husband has even made comment about how much healthier my hair looks. I may get a little dandruff by the third day of not washing it but it easily brushes out. And speaking of brushing, with as thick and long as my hair is it gets tangled bad and I have no problem brushing through it now.