Recently I bought a huge bottle of Dr Bronner's in Rose and tried using it as a shampoo. The instructions say you need to dilute but I don't bother. I just use it in controlled amounts, like a 50p sized amount. It's runny but very concentrated.
Because it's soap, it's alkaline and I can tell the difference vs normal shampoos. The pros is that it suds brilliantly, my scalp does'nt itch as much and the top layer of my hair does'nt get greasy as quickly. The cons is that it's tangly and strands tends to stick together (mattes easily, not because it's still dirty). My hair is wavy so thin locks form and makes it a little lank and frizzy. I stopped using it as a shampoo, especially because it leaves a residue and it feels worse than it did when dirty! This soap is now a body wash only.
To neutralize the high pH of the soap and help close the cuticle, tried the apple cider vinegar rinse.
There are many variants to this treatment. I filled a drink bottle with 1 part vinegar with 3 parts water. This is to pour over my scalp and it runs down my hair. 200mls of this solution does the trick. I leave it in for a minute or two and rinse. They say for super shiny hair, rinse with as cold water as you can stand. Make sure to keep this out of your eyes because it stings like crazy!
The results are noticeably softer, shiner and less tangly hair. I only do the ACV rinse once a week to clarify my hair and while it's true that the smell disappears when my hair is dry, it stinks when wet.
You can buy 5L of ACV for only £13.50 including shipping on Amazon. That's dirt cheap haircare! OK, its for animals but the acidity and it's origins are the same as the edible kind. As long as you're not taking it internally, who cares?