Hard skin simply melts away! Rock Off Glycolic Callus Peel removes calluses with an easy rollerball application and contains acids commonly used in skin care to exfoliate the surface of the skin. Key ingredients: – Glycolic acid is one of the most effective alpha-hydroxy acids. It exfoliates the top layer of skin exposing the new, soft layer of skin. – Salicylic acid, a beta hydroxy acid, has the ability to penetrate the skin to exfoliate inside the pores.