A cleansing shampoo is a type of shampoo designed to remove dirt, oil, and build-up from the hair. A clarifying shampoo is similar in that it also removes build-up from the hair. However, clarifying shampoos are generally more powerful and can be used to remove stubborn build-up that regular shampoos cannot. What is intriguing about the two shampoos is that some can also be clarifying shampoos. It all just depends on the ingredients that are used. Importance of cleansing the hair: - It helps to remove dirt, oil, and build-up from the hair. - Washing the hair can help curly hair look healthier overall. - It should be done once a week if following the Curly Girl Method.