Mudsponge Finishing SpongesMudsponge Finishing Sponges The White Finishing is a pop up sponge made with a tight cell material and is less absorbent than the Blue Workhorse. It is excellent for finishing work, final detail and clean up of surfaces and wont pull out grog or other materials in the clay body. Think of it like a chamois sponge. Natural sponges have been used by potters for years. However, the quality of natural sponges can be unpredictable and we try to be