Our heaviest duty grit based soap is made with soy and walnut shells, making it biodegradable and an environmentally safe choice. Unique soy based ingredients dissolve and emulsify soils while walnut shells provide a light scrubbing action for deep down cleaning. This formulation is very mild to the hands, yet strong enough to remove the most difficult soils. WhiskPower soaps are specially formulated to remove the most stubborn soils. They use pumice, walnut shells or other natural scrubbers to help loosen dirt and grime from the skin.