You’d never dream of washing good wool or cashmere sweater with just any old detergent, but most people don’t think twice about applying shampoo to the priceless fibre that’s sitting on their head. 2 The problem is that shampoos have a dirty little secret…they contain harsh detergents such as sodium lauryl sulphate, ammonium lauryl sulphate, which are foaming agents found in dishwashing liquid and laundry detergent. 2 Sure they are great for pots and pan...because they cut out grease! Your hair on the other hand, needs to preserve its natural oils to protect it, and your scalp. Stripping them away deprives hair of necessary moisture, amino acids, and antibodies, and thus makes it look dry, dull, and lifeless. It also does the same thing to your skin!