I'm sorry, I really don't know the recipe to make Olive Oil Shampoo. A friend of mine makes it in her spare time and I know she keeps it a secret. You might want to try massaging warm olive oil on your scalp then shampoo your hair and rinse. Then take 1/2 up of warm water and 1/2 cup of Apple Cider Vinegar and rinse your scalp. This will help with the itch. It also will condition your hair.