Grab and squeeze the lemon juice to get about 2 tablespoons juice, pour directly on the head, flatten and rub gently into the scalp. Then grab a glass of water mixed with 1 tablespoon of lemon, pour back into your hair, wait a few minutes then rinse with water. Repeat several times until your dandruff is completely gone.
With coconut milk
Mix the coconut milk from half a coconut, one glass of pineapple juice, lime juice, and a half a glass of coconut water. Stir well. Use this mixture to wash your hair once every five days. Rinse and wash with shampoo after doing so.
Source : http://tipscarakecantikan.blogspot.com/2013/03/cara-cepat-alami-menghilangkan-ketombe.html