Question: Why are people washing their hair with baking soda and rinsing with vinegar?

Sarah wrote in this post: I’ve seen your posts on co-washing, but wonder about the washing of hair with baking soda and then rinsing with vinegar… seems to be all the rave in blogland.Huh? Seriously? Really? What the heck is this all about? The idea is that you wash your hair with baking soda – pH between…