Gentle Leave-On Exfoliant with 2% Salicylic Acid for Clear, Radiant Skin 4 fl oz Gentle Leave-On Exfoliant with 2% Salicylic Acid. Unlock the secret to a luminous complexion with our Gentle Leave-On Exfoliant. Expiration Date: Salicylic Acid Exfoliant Unit Quantity: 1 Body Area: Face Ingredients: Salicylic Acid Exfoliant.