Subtract - the be-all and end-all! If it hasn't been peeled off after showering, you want our glass coating, because coated glass has very good pearling properties against water and organic liquids. The hydrophobic (water-repellent) and oleophobic (oil-repellent) properties make it easier to remove dirt and lime residues. The surface structure is smoothed out and bacteria and dirt barely find any adhesive base on the sealed surface. Coated glasses are also less likely to become new and re-contaminated. Talk to us!