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To clean a hairbrush, start by using the pointed-end of a comb to pull up the matted hair on the brush. Then, cut through the loosened hair with scissors, and pull the cut hair out with your hands. Once you've removed all of the hair, scrub the brush with shampoo and baking soda using an old toothbrush. Finally, rinse the brush off with water, and place it on a towel to air dry.
Video: How to Clean Hairbrushes - wikiHow