Green Clay cleanses and gently exfoliates. This fact is somewhat debated, since clays are not actually cleansing products. But remember how you just discovered that clay attaches to impurities to rinse them away? Well, that in itself is cleansing.
During this process you are also going to wash away some dead skin cells as well that have taken up residence on your face. Well, removing dead skin cells, that's exfoliation.
So while it can't replace professional exfoliation by an esthetician, using French Green Clay does have mild exfoliating power that results brighter, more healthy looking skin.