Ok so when I was younger I suffered a lot with greasy hair, most mornings I would have to use dry hair shampoo even thou I had washed my hair the night before.
As you can imagine I sometimes randomly ran out and being 14 I wasn't going into school with greasy hair!
So I tried to find something that would help and my savior came in the form of Johnson's baby powder!
All you need to do is tip a little into your hands and rub them together, then zyush it into your hair at the roots. Make sure to really shake your hair thou or you could end up looking grey