To make tile shine, clean it with mild cleaner and a soft cloth, then buff the surface. Use a lint-free cleaning cloth for the best results.
If residue is built up on the tiles, use a mild, acidic cleanser that is labeled for the type of tile being cleaned. Be sure to follow package directions carefully to avoid causing etching, or damage, to the tile's surface. Thoroughly rinse off the cleaner with clear water, and then polish the tiles to make them shine. Keep grout clean, too, because shiny tile still looks bad if the grout is covered in mold or dirt. Apply grout cleaner, and use a small firm scrub brush to clean the grout.