There are a number of variables involved when it comes to tile/grout cleaning. The material used for tiles (ceramic) and grout (cement) have very different properties. The last is much more porous, so the proper cleaning should be made with the right chemicals and equipment, so that the best results can be achieved without damaging the tiles, grout or underneath the surface, causing the tiles to become hollow and loose. For example, many home and business owners think that tiles should be pressure washed. That is a big mistake and may lead to serious problems.