I also suggest using an apple cider vinegar rinse after shampooing. It closes up the hair follicles and is good for your scalp. To make it is real easy: Add 2 tablespoons apple cider vinegar to 2 pints of water. After your shampooing just pour a bit onto your scalp, work it in a bit to fully get to all hair, then rinse out completely.
For others that like a shampoo in a bottle you should check out my all natural handmade Liquid Shampoos. The shampoos are incredible, take a long time to make, and are concentrated. Much better than anything you could ever buy in a store. Use sparingly and it will last a long time.