If you only have a relatively small and isolated area of grout to clean then I’d recommend using a product like Grout Deep Clean. This product is ideal for cleaning grout on window sills, floors, walls and on worktops. If you have a larger area of grout to clean then I’d recommend using a product such as Heavy Duty Tile and Grout Cleaner because it cleans to a deeper level and will help bring up the grout to a clean condition. If your grout is really badly contaminated then I’d recommend using Grout Colorant which I’ll talk about more about later in this FAQ series.Copyright Ian Taylor and The Tile and Stone Blog.co.uk, 2013. See copyright notice above.