Lemon juice:
Lemon juice when used on your hair is an effective treatment for dandruff. Its citrus property cleanses the hair. Squeeze a lemon onto your hair and massage into the scalp, and then wash it out using water and your preferred shampoo.
Coconut Oil:
Coconut oil is used in several parts of the world as an aid to beautiful hair. It has enriching vitamins and nutrients that help your hair to grow long and lustrous. In addition, it also combats dandruff. 
Massage into the scalp before washing hair. If possible, do so a night before, so the oil can soak in overnight.
Vinegar:
Vinegar is great to add some bounce and vitality into dull and lifeless hair. Mix a little vinegar into warm water, and then rinse your hair with the solution. You hair will look revitalized.