Simple Green Safety Towels® are pre-moistened with non-toxic, biodegradable, industrial strength Crystal Simple Green®. These multi-purpose cleaning towels are the fast, easy, safe and effective way to remove soils from skin and industrial surfaces. Crystal Simple Green is USDA authorized for use in Federally inspected meat and poultry plants. Colorless and odorless. Both non-abrasive and abrasive sides.