How to use castor oil - - Only castor oil can be applied to the scalp , massaging the hair from the scalp to the ends of the scalp can bring a lot of changes. - However, be careful not to use excess oil. Because castor oil is much thicker than other oils it will be harder to wash off. - You will get the best results if you can apply castor oil on your hair all night and wash it off in the morning. But if you do not have time, then apply castor oil on your hair for 15-20 minutes. - First wash your hair well with lukewarm water. Make sure the water does not get too hot. Mix 1 part hot water with 2 parts plain water for proper temperature. Then wash your hair with shampoo. - If you can use it every day, you will get very good results. But if you do not have time, try to use 3-4 days a week.