the biodegradable abrasive compositions consist of a plant - based natural abrasive agent , calcium carbonate , polymeric material , and a binder . the natural abrasives may consist of a plant - based cereal grains or fibers . the polymeric materials of the preferred embodiments include starch and poly - vinyl alcohol , either alone or in combination . the products associated with the biodegradable abrasive compositions are gently abrasive and readily disposable films or coatings . the products are designed to maximize the use of agricultural bi - products and avoid harm the environment .