Nili Nathan shows you how to make a homemade clay facial mask for oily skin. To make your own clay mask, do the following: You will need 3 tbs of green clay. Mix with some hot water, about 3 tbs. Add 2 drops of Rosemary essential oil, 2 drops of lemon essential oil. Mix well with a fork, until it becomes a paste. Add more hot water if needed. Apply evenly to your face and neck, leave on for about 7 minutes. Rinse off with warm water. Enjoy the deep cleansing, healing effect.