What is the main purpose of shampoos?

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    The purpose of shampoo is to remove dirt and oil from the surface of the hair and scalp. Soap molecules are special because they allow oil and water to mix. One part of the soap molecule sticks to the water molecules, and the other part sticks to the oil molecules. After washing with soap, the rinse water will take away the soap molecules and the attached oil molecules along with any water and oil-soluble dirt. Pretty much any type of dirt is soluble in either oil or water, which is what makes soap such an effective cleanser.