Clean hair: squeaky test on hair

You want to know if your hair is really clean? Then do the squeak test! So it goes like this: After washing you take a wet strand between your fingers ... squeaks it is your hair clean, if there are no residue in the hair.

Thouy: If the shampoo is silicone free, then the hair squeaks, if not, then not. Simple principle.
Back then, about 10 years ago, the first cleansing shampoos came on the market, which washed the silicone residues from the hair.
Today, we know about the adverse effects of silicones and have begun to eliminate them from many products. In that sense, there are more hairs today that squeak, not because they are clean, but because they are not smothered under a silicone sleeve.