It’s important to keep tiling in your bathroom and kitchen clean for hygienic as well as aesthetic reasons. Tile grout is porous. This means that not only does it stain easily, particularly if it’s white, or pale coloured, but it also absorbs moisture from the atmosphere collecting stains from skin oils, dust and dirt in the atmosphere and encouraging mold and mildew to form. In fact, whatever cleaning method you decide to use when cleaning bathroom tiles, it’s a good idea to run the shower as hot as possible for five minutes beforehand, as this encourages the grout pores to open and release the tightly-held dirt and mold spores.