Select a shampoo that has natural apple cider in them, along with a rosemary tea. Both of these ingredients are excellent for your dilemma. They also have citric acid, which is a natural astringent.
While shampooing do not scrub your scalp. Vigorous scrubbing will activate the sebaceous glands. Massage it gently until it reaches a rich lather, and leave it on the scalp for 5 minutes and rinse well. Blot excess water from the hair when drying, always keeping in mind that any vigorous action on the scalp will send a signal to the sebaceous glands to work. This goes for combing and brushing as well.
Shampoo every second day to start, moving up to every third day after the first two weeks. You really shouldn’t have to wash your hair more than twice a week to maintain clean, healthy hair. If your scalp feels oily while you are adapting to this routine, dab some Witch Hazel to the roots with cotton pad.