Do you have a high efficiency washer? They're great unless you cloth diaper because you need a LOT of water to get those things clean. After trying to mess with the settings and still not being satisfied, I found a great tip from Bummis: Get 1 or two towels soaking wet and put them into your washer with your diapers. It will "trick" your washing machine into thinking there is a heavy load. Voila! More water to get those diapers nice and clean.