Which product is essential for cleansing the hair and scalp effectively?

Shampoo is specifically formulated to cleanse the hair and scalp effectively. It contains surfactants that create lather and help lift dirt, oil, and product buildup from the hair and scalp surface. The design of shampoo allows it to penetrate the hair fibers and remove impurities, preparing the hair for conditioning or styling.

While conditioner is important for adding moisture and detangling after washing, it is not a cleansing agent. Texturizers are used for altering the hair's texture, typically for styling purposes, and do not provide the cleansing essential to maintain hair health. Hair oil is beneficial for hydration and nourishment but can attract dirt and may not effectively remove buildup without the initial cleansing step provided by shampoo. Thus, shampoo is the essential product for the cleansing process, ensuring both the hair and scalp are clean and healthy.