Pumie Heavy Duty Scouring Stick. It effectively removes rust, stains, and paint from porcelain, ceramic tile, concrete, masonry, and hard metal surfaces. Its abrasive cleaning action tackles baked-on food, grease, carbon buildup, water and acid stains, rock-hard mineral deposits, and other stubborn substances. Safe for hands and children, it contains no harsh detergents or chemicals. For best results, wet the stick and rub it on the surface using back and forth strokes. The paste buildup helps clean and polish. Wash the cleaned surface of residue and hold the stick under a water faucet to clean it.