Zep Shell Shock is a heavy-duty industrial hand cleaner that utilizes the natural cleaning power of soy and walnut shells to clean the toughest grease and grime. Its powerful cleaning action removes stubborn grease, tar, resin, paints and adhesives while keeping hands soft. The soap is free of solvents and completely biodegradable, making it an environmentally preferred option. Part of Zep's GreenLink program, a line of products formulated to be safer for the environment and its users.