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The main function of the shampoo is to remove the surface grease, the skin debris the dirt accumulated from the environment and the residue of hair-grooming, cosmetics from hair shaft and scalp, leaving the hair soft, lustrous and manageable. Of course this cleaning activity has to have no side effects for the health of the user.
The remove of lipid soil from the hair is controlled by the same processes as those that have been identified  in wool detergency, in spite of the differences in respect of time and temperature. The principal agency is generally considered to be the "roll-up" mechanism i.e. the displacement of surface soil by the detergent solution . The detergent micelles make contact with the lipid surface, form lipid-detergent co-micelles which detach and "float away" into the bulk acqueous solution. The  "signal" to which the user reponds when applying a shampoo is how quickly it builds up lather and how copious that lather is. This tends to colour the user's later impressions of the other characterististics of the shampoo.
Scientifically speaking foaming properties play not a fundamental role in the cleaning of hair. Certainly it is more important the kind of cleaning agent (surfactant) used and the active compounds selected for scalp health, including antidandruff or anti-oilness additives

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