Bleach: Bleach, also known as  sodium hypochlorite or simply as chlorine, is used in everything from plastics manufacturing (PVC), in swimming pools, to laundry detergents and many cleaning products. According to Audubon, chlorine is a suspected cause of ozone depletion and a serious threat to the health of humans and wildlife (linked cancer to endocrine disruption). Skin Deep score: 7-9, depending on usage.