Shampoo last touched my tresses over three weeks ago... I believe. (Since I was only using it a couple times a week anyway, it's easy to lose track.) Instead, I've been massaging a baking soda solution into my scalp and rinsing it out.
I don't think I look like a total greaser (though my friends may disagree). In fact, I'm still struggling with dryness on the ends of my hair and the locks around my face. I'll try to remedy that by conditioning with apple cider vinegar, if I can ever remember to put a bottle of the stuff in the bathroom.
My reasons for attempting this transition? It started with a desire to steer clear of the nasty chemicals found in the vast majority of shampoos (polyethylene glycol, ceteareth, parabens, etc.). But even after I found some safer brands that I liked, I still had to contend with my ever-increasing compulsion to reduce the number of plastic-packaged things I buy (for a number of reasons). Finally, the idea of just not ever having to buy shampoo appeals to my general orientation toward simpler living and frugality.
Creative Commons photo by Flickr user Clean Wal-Mart