Lately, I've been reading about the curly girl method which comes from Lorraine Massey the author of Curly Girl. It involves using mild cleansers with no sulfates and is also referred to as "no-poo". I noticed my hair looking quite dull and I figured this was worth a try. Apparently sulfates are in other harsh soaps like dish washing liquid or laundry detergent and strip the hair of all its natural oils. It's not necessary to to use sulfate in your hair to get it clean. I decided to try a sulfate free cleanser called Hair One which you can purchase at your local Sally's for about 8.99. It's a an herbal cleanser and conditioner in one. It was odd to me at first to have no suds in my hair, but my scalp still felt clean nevertheless, and my hair is already looking less dull!
If you would like to read more about the curly girl method check out this article on wikihow.