I don't shampoo my hair. Some people call it the "no-poo" method. I haven't used shampoo since June - and I have no plans to turn back!
I had a friend in college who raved about her experience going shampoo-free for a while. I try to live a natural lifestyle, and I'm bit by bit decreasing my use of chemicals and scary ingredients in my daily life. But when I heard about using baking soda on your scalp to wash your hair, I was intrigued for hair health reasons in addition to the artificial chemical-free approach. Baking soda doesn't strip your hair of all its natural oils like shampoo does, leaving your scalp more naturally balanced. I've found that my hair is softer, easier to style, has more body, and can last longer between washes. Not to mention that it's cheaper!
All you do is saturate baking soda in water in a bottle (appx 1 tablespoon per cup is a good place to start, but there is no science here. I find that the more baking soda I put in the "cleaner" my hair feels). Apply the solution directly to your scalp and work it in with your fingertips. Then rinse as usual. I follow up with a natural unscented conditioner on only my ends, but if you're interested in going all out, squirt apple cider vinegar as you would conditioner.
Would you try it?