This really depends on the amount of hair you have. If you have short to medium length hair, use a half dollar-sized amount, focusing on the scalp first and adding a little water to evenly distribute and work the product around. For longer or thicker hair, start with the same amount, but begin at the zone of greatest density at the back of the head. Once thoroughly worked through there, use another half dollar amount to work through the rest of your scalp and hair. Add more cleanser as needed. For a deeper cleansing, rinse thoroughly and repeat.