This is something I've been thinking of trying for a long time, but was too vain or was never convinced that it could work. But the writers over on Simple Green frugal Co-op have inspired me.
When I was a child, there was a popular science television programme on the BBC, which name I forget. One of the episodes has always stuck in my mind. A lady was experimenting with not washing her hair with shampoo any more. She was going to tie her hair up in a turban for a number of weeks, until her body was able to regulate the natural oils in her hair again. She had long, dark brown hair which reached beyond her waist. The TV audience were obviously not convinced that it could work and sounded revolted by the idea. After a number of weeks, the lady was back on the programme, with the turban on, and the moment came to remove it. Off it came, and down flowed this gorgeous wave of beautiful, healthy, shining hair. She hadn't shampooed it once, (apparently) and everyone was amazed.
I've also been concerned about the chemicals which are leaching into the water system, also about the fact that all those chemicals can't really be good for our skin; after all, how did our forebears cope? My mother-in-law says that they used to use something called 'Kernseife' (a pure, natural, unadulterated soap, which you can still buy here in Germany, for all their washing needs - hair, clothes, everything. We always take this soap when we're on a hike or when camping because it's environmentally friendly. It also lasts longer than the usual perfumed bars.