No more plastic/nylon sponges, 100% biodegradable wood pulp sponge is designed to work. This sponge is naturally grease resistance, meaning? Clean sponge all the time With the sisal natural fibre scrub, this sponge does it all! Want it to be invincibly clean? Simply toss it into the dish washer, or microwave the damp sponge for 30 second and you have it.