For the best experience, apply a small amount to wet hair, focusing the lather on your scalp where oil and buildup are most concentrated. Gently massage it in with your fingertips, then rinse thoroughly. Because it is a more active cleanser, you generally do not need to leave it on for an extended time—a minute or two is sufficient.
Since it is designed to clarify, you may find your hair feels clean but the lengths could benefit from additional conditioning. It is common practice to follow this type of shampoo with a conditioner or hair mask applied mainly to the mid-lengths and ends, avoiding the roots. This helps balance any potential drying effect from the cleansing agents.
You can use it as often as your scalp tolerates. Some people with oily scalps use it every wash, while others incorporate it once or twice a week as a clarifying treatment within a routine that also includes milder shampoos. Observe how your hair feels over several uses to find your ideal frequency.