Natural oils in avacado's can be very moisturizing if applied to the scalp. Olive oil works well also. Just massage a small amount onto your scalp and work through your hair, wrap up your hair in a towel and sit for 15 minutes. Then wash and rinse.
Use olive oil to coat your hair and massage into your scalp. After applying soak a towel in hot water, wring out excess water, and wrap hair in the towel. After 20 minutes shampoo with normal shampoo to get the olive oil out.