Hair gets dirty fast. They trap dirt and dust like carpets, provide a comfy home for head lice, and yet you can't just shave it all off without your friends gossiping about it. To keep your hair clean, wash it with warm water and shampoo, which removes dirt and grime from hair and often leaves a light, fresh scent. Hair shampoo has often been criticized for containing carcinogenic chemicals, which led to some people using baking soda or vinegar to maintain their hygiene.
Sold in supermarkets and pharmacies, and found in most bathrooms.