Don't just wash the grease away
As hard as it may be to resist, the cleaner your hair is, aka the more you wash it, the more likely is it that you'll end up with greasy hair. So, don't wash your hair everyday. Sure, it's nice to have newly washed, fresh hair every single day but it's nicer to be able to not wake up with greasy hair every morning. But it takes time for your hair to adjust to this, so for those emergency days when your hair looks like a proper mess you can always tie it back or wear a headscarf. However, once your hair adjusts, you will notice a dramatic difference by not washing it everyday.
Use your schampoo sparingly
Apparently there's a specific amount of shampoo you should use to ensure hair doesn't get too greasy (something no one's ever told me about). But when washing your hair, it is very important not to use too much shampoo as it can become heavy on the hair or you can actually damage your beautiful hair. Generally speaking, a 10 pence piece amount of product will get the job done.
Only apply conditioner on the ends
Did you know that if you run out of conditioner faster than schampoo you're doing the whole thing wrong? Well, now you know. Many of us with dry or coloured hair fall into the trap of applying it higher and higher in order to de-tangle until it's basically at our roots. But the higher you apply it, the faster your hair will become greasy.
Eat the grease away
People say the way to any person's heart is through his/her stomach and that seems to apply on your hair as well. Did you know that if you cut out as much oil from your diet while eating more fruit and vegetables actually can improve the condition of your hair and make it appear less greasy. Well, now you know!
The apple cider vinegar method
This is actually something I saw on Facebook and is as simple as it sounds. All you need is water and apple cider vinegar. Simply dilute apple cider vinegar in a cup of water and pour it through the hair. Leave it in for a few minutes and the greasy build-up should be gone without a trace, and your hair should be left squeaky clean and 100% grease-free.