My hair is greasy. What do I do?
    An oily scalp is a vicious cycle that is actually often made worse by attempts at reversing the problem. You've likely already been told by someone that washing your hair more often makes your oily scalp worse. That's completely true. What happens is this: you wake up with greasy scalp, so you wash your hair to remove the grease. In the process you strip your hair of it's natural sebum. Your body's response is to replace the natural oil that it's lost. Some people's body's natural response to replace the stripped away sebum is excessive, and you can find yourself feeling oily again by lunch time. So the next time you wash your hair you use a product to dry out your scalp further. Your body responds in a panic to re-hydrate that lost moisture and the oil is unleashed. You can't win chasing this greasy cycle.
The more you wash your hair, the more oil your scalp produces, and the bigger your problem becomes. The cycle is simply completely unfair, but you can break it. The best way to break the cycle of the over production of sebum is to skip washing your hair and make the break between washes longer.

Start slow. Take a day once a week and skip the shampoo. Pick a day that you can wear a hat or when you'll be home all day and it doesn't really matter. Then make it two days a week. Ideally, you should be able to go 2-3 days between shampoos to really get the oil production under control. Just don't expect to get there overnight.

You can also try:
Cold water rinse: Rinse your hair with cold water after washing and conditioning. Rinse your hair in cold water. Make sure you remove all your conditioner and finish with cold water. This is hard in winter, so donít go freezing yourself in ice water, but a cool rinse of water will close the cuticle and seal in the moisture to each strand. Itís ok to shampoo your hair in hot water but finish it with a cold rinse.

Apple Cider Vinegar Rinse: An apple cider vinegar rinse can help restore life to your hair in a matter of moments. To safely rinse your hair with apple cider vinegar, mix four parts water to one part vinegar in a spray bottle. Spray your scalp well and work into your hair with your fingers. Allow the vinegar mixture to sit for few minutes and then rinse with cool water. Follow with a light conditioner and rinse well. Dry and style as usual. You should notice shine and body restored to you hair.

Baking Soda Rinse: Start by mixing 1 part baking soda with 3 parts water. I have shoulder length hair and mix about 2 to 3 tablespoon of baking soda with 3 times that amount of water in a small squeeze bottle. You can adjust this depending on your hair length. Apply the baking soda and water mixture to dry or wet hair by starting at the roots and working to the ends. Let it sit for 1 - 3 minutes then rinse with warm water. After washing and rinsing with the baking soda mixture, you can also to apply a vinegar rinse.