To a degree, we have discussed this in other areas of these FAQs, but the question is well worth revisiting. Typically, two situations cause the most difficult cleaning problems. First, when a stain penetrates into the body of the tile. Second, when the surface of the tile catches dirt that then sticks to it. A tile like porcelain, that does not allow penetration into the body, with a finish that is not overly rough, will be relatively easy to clean.