The first facial scrub you probably used was St. Ives Apricot Scrub, a viscous, gloppy paste speckled with granules of crushed walnut shells that you rubbed on your teenaged visage in an attempt to sandblast your way out of acne, operating under the assumption that it was good for you. As it turns out, that might not be the case and Unilever, the parent company of St. Ives, is …