Found this product description for Williams on Amazon.com. One tube was $14.95
Williams Stove Polish 3.5 oz. tube brings a satin black finish to cast-iron and sheet metal stoves. Excellent for andirons, fireplace screens, stovepipe, and fireplaces, as well as antique iron pot and kettles. Made from graphite and carbon black. For over 100 years, Williams Stove Polish has been used to bring a beautiful low-luster black finish to unpainted cast iron surfaces. Rely on this black satin semi-paste polish to restore the finish on steel and cast iron wood stoves, coal stoves, barbecues, hibachis, andirons, ornamental ironwork, iron posts and kettles. Made from graphite and carbon black pigments. Contains no waxes, smelly solvents, or flammable materials. Do not use on a hot stove. Use only on cold cast iron or steel. Remove loose rust with a wire brush or steel wool. Wipe off dirt and dust with a soft rag. Squeeze polish onto rag and apply to stove. After drying for a few minutes, rub briskly with a clean cloth until cloth comes away clean. Cleans up with soap and water. Avoid contact with eyes. If contact with eyes occurs, flush thoroughly with water. If irritation persists, seek medical attention. Keep out of reach of children.