Over time, the grout between your bathroom tiles can discolour and erode. Not only does this look unsightly, but water can seep into the walls, causing damp and mould. The problem is often worse wherever water collects, so you’ll probably notice it first on the areas around the bottom of showers, sinks, baths and windowsills. Discover how to clean, remove, repair and re-grout your bathroom tiles in our guide.