I was using a great (and affordable) organic shampoo from Priceline, organic care I think it was called, haven't been able to find it at the shops again since. It was the only one I've used that's actually removed the product cleanly out of my hair without making it feel like straw (and I have a whole collection of ones that I've tried and abandoned because of the straw-hair factor). It's not completely free of chemicals but I'm mostly trying to reduce parabens so it ticks that box ok.