Danny
I have long suspected that most branded shampoos were just TeePol plus a bit of cheap perfume (just as most aftershaves are surgical spirit plus same).
Reminds me of the story of the boss of one of the big shampoo makers in the 1960’s whose prime hair shampoo product was egg shampoo to supposedly make the ladies hair gleam, or so it was claimed. Anyway he visited his shampoo manufacturing plant and ceremoniously broke a single egg into a massive 1000-gall vat of shampoo.
Reason was to ensure his company could claim that his money-making egg-shampoo met its claims that it was “Egg Shampoo”.
Don’t think he would get away with it now!