Do you notice if you go one day without washing your hair it starts to look greasy so quickly?! Here's a tip to help on those days your running late or just don't have time to wash and style your hair!
    Take a BIG fluffy makeup brush and dip it into a pot of loose powder (or baby powder). Tap it on the back of your hand to get off excess powder and then dust it over your greasy roots and wait a minute. then just blend it into your hair.
    The powder will absorb the oil that makes your hair greasy! Just don't use this method all the time shampooing and conditioning is needed in between, lol  :-P