Kérastase Chronologiste Charcoal Purifying Pre-Shampoo Kérastase Chronologiste Charcoal Purifying Pre-Shampoo ($46) cleanses dirt, pollution, and flaky dead skin cells off your scalp, and then hydrates hair, all before actual shampoo enters the picture. Image Source: Sephora Kérastase Chronologiste Charcoal Purifying Pre-Shampoo $46 from sephora.com Buy Now