Hard Water Stain Remover: A Complete Guide to Removing Mineral Marks Hard water can leave stubborn white, cloudy, chalky, or crusty marks on household surfaces. These deposits commonly appear around faucets, shower doors, sinks, tiles, bathtubs, and other areas exposed to water on a regular basis. A hard water stain remover is designed to target mineral buildup more directly than an ordinary surface cleaner, making it a useful option for homeowners, renters,...