The experiment started well. My hair was a bit oily on top, but was fuller than in recent years. Then I had my hair cut. Not thinking to speak up, the stylist shampooed, conditioned, spritzed my hair during my cut. So, I'm starting again.
Today I used a simple mix of baking soda and water, the oily look vanished. My hair looks like I got a perm, but all I did was eliminate the shampoo and take a simplicity approach.
So far so, good. I'm curious to see how this hair care method will hold up when vacation ends and life returns to normal.