The Christophe Robin Cleansing Purifying Scrub With Sea Salt ($19 - $5; sephora.com) is a great, clarifying scrub for sensitive oily scalp that I like to use once a week as a clarifying treatment. Its a gritty, solid shampoo that foams amazingly well, leaves my scalp squeaky clean, without any residue or build up and smells fantastic. Its a sulfate based cleanser and I wouldn’t recommend this more than once a week or twice, if you have a very oily scalp. The sea salt crystals wash off easily and a little bit goes a very long way with the product. It does amazing things when used weekly - helps my conditioner work better, my hair feels fuller and there’s also a gentle root lift because of how clean my scalp feels. I do think its a little pricey for what it does, but definitely a nice weekly treat to have in your shower, especially if your hair tends to get greasy with styling products!