Any place you have ceramic or porcelain tiles, you have grout. That could mean inside your shower, on your bathroom walls, in your tile floors, in your kitchen and even in hallways. Methods for cleaning grout should be effective whether you’re cleaning grout in your bathroom, your hallway or your kitchen. However, if any of these locations feature marble or other calcareous stone, you will not want to use vinegar or other acid-based cleaners because they can damage the tile.