Stone Forensics recently released its new Stain Sponge for removing all types of stains from stone such as marble, granite, limestone, terrazzo, concrete and brick. Nasty stains such as coffee, wine, oil and even rust can be removed with the Stain Sponge. The 4-inch by 5-inch Stain Sponge comes in packs of three or can be purchased in bulk. A stain removal booklet with detailed instructions as well as a care guide is included. The Stain Sponge, which contains no harmful chemicals, is completely biodegradable.