Interesting, I hadn't thought about this, I do dilute my shampoo though (when I use it) but I use my condish neat when I co-wash. It could be worth doing on the odd day, although I'm not sure I could stick to it every time without getting a bit itchy, my scalp can be a grumpy thing. I might try diluting my shampoo even more and diluting my co-wash as well... Thanks for the info!
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