>>The previous paragraph happened often enough, and I have done some research (i.e. searched again and again and couldn't find one bottle in any of the shops which had the word "shampoo" printed large enough). Same goes for socks - if they weren't on the shelf with other, unpackaged socks, you wouldn't know what's inside.
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>I just want to find a shampoo somewhere that doesn't double as either a salad dressing, or fruit punch. I want something that I put on my hair, rub it in, rinse it, and my hair is clean. Why is that so terrible a thing to want?

Our youngest does it like this: get the hair wet, put a solution of two tablespoons baking soda in a glass of water on it, rub it a bit, rinse, same proportion of vinegar/water, rinse. Her hair looks great.

I use a different trick: my wife started making soap as a once-in-a-while hobby, and her recipe soap actually works great - no itch, no problem, feels great, washes away easily, none of those that just won't wash away, it just works. And it feels much better.