Peter Thomas Roth Glycolic Acid Clarifying Tonic,fragrance free, dye free Glycolic Acid Clarifying Tonic for t-zone, oily, problem or combination skin. Clarifies the skin, removes excess sebum, helps smooth out roughness and helps reduce the appearance of fine lines, wrinkles and other signs of aging. This toner removes excess residue and restores skin to its natural pH, allowing skin care products that are applied afterward to penetrate better.