With the increase in use of tiles and natural stone by both architects and the general public in recent years cleanliness has become rather problematic. General off the shelf cleaners and a mop may appear to be working when the surface is new but eventually the dirt and soil begins to build up, tiles start to look bland, grout lines loose their colour and can start to turn black.
On running your finger along a grout line it will probably feel greasy, this is due to constant mopping or conventional cleaning which tends to loosen the dirt, move it around and then deposit it in the grout lines. Until now there has been no real solution, people have either accepted the surface can't be cleaned totally and put up with it or in extreme cases rip out the tiles and replace them.
WORRY NO MORE, WE CAN FIX IT!