I've often felt that shampooing every day wasn't doing my hair much good, and I need to condition it heavily with every shampoo, but the alternative people usually give is 'Don't wash your hair at all, just brush thoroughly' and I never felt I could go that far.
However, I have now gone a week and a half, washing my hair daily with water only, and I think it's working out pretty well. I think the water is enough to clean it. My hair doesn't feel greasy. I am still blow-drying it, which probably is something else I ought to drop, but I need it dry before I walk to work.
Anyone else tried this, or might like to try it? I'm not sure whether it would work with long hair. Also, when I lived in London my hair and face got a lot dirtier every day, and I'm not sure water would have been enough. But at present, it seems to be working out better than I expected.
I might shampoo once a fortnight or something. Or I might abandon this project if my hair suddenly goes horrible.