ABSTRACT
The primary function of a hair cleanser, or shampoo, is to clean the hair: a process that can be defined as the removal of unwanted material from the hair substrate. Insofar as this purpose is common to the cleaning of virtually any substrate, there is much that can be learned about the cleaning of hair from the results of detergency investigations in general, and those on fabric laundering in particular. Several excellent reviews on these topics exist [1–5].
