you really only need to shampoo it twice a week since you don't use any extra products. if you shampoo it everyday it robs your hairs natural oils and can prevent it from becoming shiny and silky. when you DO shampoo it, try to mostly get your roots. when your rinse out your hair, it will run down the rest of your hair and that will be enough to wash it

also, before you wash your hair you can put conditioner on it (when its dry - it absorbs moisture better) and leave it in for about 15 minutes. then go through your regular washing routine.