Cleansing is something that we all do several times a day; indeed, it’s precisely because it is such a matter of routine that it often fails to receive due attention. In fact, it is important to remember that proper cleansing should clean the skin without irritating it. In a word, it has to be balanced: respecting the skin’s characteristics and parameters as much as possible.
The verb cleanse literally means “to rid of impurities”, and indeed cosmetic cleansers serve to remove the dead cells of the stratum corneum and secretions such as sebum and sweat from skin and hair, as well as dirt from the surrounding environment.
Cleansing is also a question of hygiene; after all, it is the first step in keeping our bodies clean and fresh.
In general, dirt is lipophilic in nature, meaning that it has an affinity for fats and oils. This means that water alone, even when hot, is not sufficient to remove it effectively.
So, it is essential to use some special substances together with water to increase its affinity for such dirt, thereby increasing its effectiveness as a cleanser.
Depending on the action mechanism of these substances, the result may be cleansing by affinity or cleansing by contrast.