Loofahs

For the whole body, but especially elbows and knees, try a loofah. Loofahs are about as natural as you can get for exfoliating, since they are simply the dried insides of a gourd. You can use one to scrub the whole body with warm water or with the addition of a mild soap. For hard to reach spots, like the middle of your back, you can purchase a loofah on a wooden handle.