I just washed my hair with no shampoo. I've read about it but I've been too chicken to try it. So I let my youngest sister try it first.
Basically, what I did was mix 1 tbsp of baking soda with enough water to make a paste and worked the paste into my scalp. I massaged it in and let it sit for a minute or so before rinsing. Then I rinsed it out. Right before getting out of the shower I rinsed my hair with 2 tbsp of apple cider vinegar mixed with a cup of water.
Currently, my hair is full and soft. I had my doubts since after rinsing the baking soda my hair felt odd. I didn't think I would be able to get a comb through my wet hair but it ran right through. I probably used too much vinegar since my hair has a very faint vinegar smell. I'll probably use just 1 tbsp next time.
The whole idea behind this is that commercial shampoo strips all natural oils out of your hair and, consequently, your body produces more oil to replace it. So the more you wash your hair, the more oil your scalp produces and the more you have to wash your hair.
The plan is to try this combo for 3 days and then switch to using it 2-3 times a week. Some people report hair that is greasier than normal for 1-3 weeks before reaching equilibrium and then their hair is silky, voluminous and soft.
I shall report my results in 3 weeks.