The Magic-Stone Heavy-Duty Cleaning Stick easily removes stubborn stains such as paint, plaster, oxide, cement, adhesives, silicone and grease on the above surfaces without scaring or damaging the surface. It's ideal stone, concrete, iron, steel, hard metals, steppingstones, outdoor tiles and more. It can be used on wet or dry surfaces. Made of recycled chemical free windowpane glass that's been heat-treated, the Magic-Stone Heavy-Duty Cleaning Stick is engineered with rigid properties that won't absorb liquids or steam, which contribute to the growth of harmful and dangerous bacteria. The block has bacteriostatic properties that prevent the spread of bacteria and other microorganisms. It also meets sustainability standards and it is 100% Eco-Friendly. It is non-toxic to you or the environment. Magic-Stone Heavy-Duty Cleaner is not a hard pumice stone that is abrasive and can scratch some surfaces. Magic-Stone Heavy-Duty Cleaning Stick is gentle, yet effective as it wears down over time. You only need apply slight pressure to get results, the more pressure you apply, the faster it will wear down. Thanks to the exclusive manufacturing process, a hygienic and bacteria free product is obtained, with powerful properties that remove even the most stubborn stains. Do not use on delicate surfaces.