A deep cleansing pre-shampoo treatment for hair and scalp. For days when your hair needs an extra-thorough cleanse, there’s the Kérastase Chronologiste Pre-Cleanse Shampoo Régénérant 200ml. As the name suggests, it’s one you use before washing your hair, and it’s aimed at scalp and hair health. Enriched with charcoal, Vitamin E and hyaluronic acid, this deep cleanser removes dead skin, product build-up, and environmental pollution.