Obagi-C RX System C-Cleansing Gel with Vitamin C 6.0 oz: Buy Obagi Cleansers - C-Cleansing Gel prepares and conditions the skin for Obagi-C Rx System, the most effective Vitamin C System available to help your skin become more radiant. This concentrated cleanser removes excess oils, residues, makeup and rinses clean, leaving skin feeling refreshed and smooth. * Type: Gel