How do you stop your hair being greasy?

heyy! i have this problem too, but depending on what your hair is like, you should try not to use too much hair product eg mousse, gel, hair spray, use 'deep cleansing' shampoo (removes old product completely) dont use conditioner on the roots of your hair, and tigh your hair back at night, and finally on days you forget to wash your hair, use dry shampoo, and tigh your hair back! hope this helps!x