The stubborn white flakes on hair cause embarrassment without fail. Kiss goodbye to dandruff with some help from aspirin natural oils and more. Aspirin: Take two tablets of aspirin and crush them into a fine powder. Then add it to shampoo that you would use to wash your hair with. Once it's in lather let it remain in the hair for one to two minutes and then rinse. Then wash the hair again with normal shampoo in order to eliminate any powder that may remain. Aspirin contains salicylates which is the active ingredient in dandruff shampoos that contain salicylic acid.