Shampoo is a liquid hair care product used to clean the hair. The reason for using shampoo is to remove unwanted sebum buildup from your hair without stripping it to the point of spiraling out of control. The properties of a good shampoo are quite obvious. Shampoo should remove oil and dirt, leaving hair shiny, strong and manageable. The main purpose of shampoo is to remove dirt and oils from the surface of hair fibers and scalp while the main purpose of conditioner is to make sure the hair is smooth for styling.