In the case of poo, there should be no more visible poo stains left on the wipes. For pee, check the portion of the diaper that is wet and concentrate on cleaning that area of the baby's bottom. If baby's bottom is still slightly soiled when you thought you had cleaned it properly, baby could end up with diaper rash. If baby's skin is red when you do a diaper change, make sure you wipe that area more carefully in future.