Squeaky clean

When you wash your hair, be sure to get it SOPPING wet before actually applying the shampoo. Why? Well, shampoo is designed to work with water. Hence, the wetter your hair is, the cleaner it will get. Also, by making sure your hair is fully saturated, this will also allow you to completely rinse all the shampoo out when you're done. And if shampoo does get left behind, it's like a dirt magnet. So, be sure to start with very, VERY wet hair, shampoo (from the roots down, of course) and then rinse thoroughly. That way, your "second day hair" won't be greasy or limp from leftover shampoo or attracted dirt.