The first step in getting rid of dull, discolored skin, Obagi-C Rx C-Cleansing Gel is designed to prepare your skin for all the benefits the Obagi-C Rx system has to offer. It deeply cleans and hydrates to improve not only the clarity of your skin, but also the tone and texture of your skin. Your skin will be fresh, healthy, and sparkling clean. 6 fl. oz.