Hard water, which contains high levels of minerals like calcium and magnesium, affects approximately 60% of the UK, leading to unsightly stains and limescale build-up on bathroom fixtures. A Reddit user discovered that the only effective solution for removing these stains was using 0000-grade steel wool, which is safe for delicate surfaces. She described her cleaning process as quick and easy, taking only about three minutes to achieve a spotless finish. It is crucial to use the finest grade to prevent scratching chrome surfaces. Before applying the steel wool, she recommended washing the area with warm water and a small amount of dish soap to remove grime. Additionally, soaking a cloth in white vinegar and applying it to the stains for 10-20 minutes can help loosen the residue. Users are advised to avoid harsh cleaners that can damage finishes, such as bleach-based products or abrasive pads. This cleaning hack is particularly useful for significant limescale build-up rather than routine maintenance.