A way to stretch the value of your baking soda shampoo even further is by introducing a "dry shampoo" on some of the days in between. I find that I will now only wash my hair every 4 or 5 days. On that 4th or 5th day (when I start seeing a bit of grease, and really only in my bangs), I will apply some corn starch to my hair with a "blush brush" or some other fairly large soft bristled brush and then comb it out. Apparently it soaks up the grease and moisture and when you brush your hair, that all goes with it! Magical dry shampoo! Corn Starch! Woo!