Olaplex To use Olaplex No.4 Hair Perfector shampoo, start by wetting your hair thoroughly with warm water. Then, apply a generous amount of shampoo to your scalp and hair, and gently massage it in with your fingertips. Work the shampoo into a rich lather, paying special attention to the roots and areas that tend to get oily. Rinse your hair thoroughly with warm water, making sure to remove all traces of shampoo. For best results, follow up with Olaplex No.4 Hair Perfector conditioner to nourish and hydrate your hair, leaving it soft, smooth, and manageable. Use Olaplex No.4 Hair Perfector shampoo regularly to maintain healthy-looking hair that shines with vitality and radiance. Auto Scents