Among these ingredients, salicylic acid rates highest as the primary active component in a cleanser for oily skin. Because salicylic acid is lipophilic (oil-soluble), resources from the American Academy of Dermatology and the Dermatology Center for Skin Health note that it can uniquely penetrate deep into pores to dissolve trapped sebum and dead skin cells rather than merely washing the skin's surface. Formulating it alongside gentle surfactants provides the ideal balance—effectively clearing excess oil and debris while preserving the skin barrier to avoid triggering a rebound-oil effect.