(1) You should clean the tiles with a mixture of dish washing detergent and warm water. You should use a soft sponge to avoid scratches on the tile surface. Ideally, you should apply sealants while installing the tiles to avoid deposition of dirt and stains.
(2) You can clean the stubborn stains with the help of a granite poultice. You can prepare a paste of dish soap, wheat flour and water to clean the stains. After preparing the paste, lay it on the stain and place a plastic on it. Keep the paste on the granite tiles for a fortnight and clean it later with water.
(3) You can clean the ink or wine stains with help of a poultice prepared from molding plaster and bleach. You can clean the oily stains by preparing a paste of molding plaster with water and leaving the mixture for few hours so that the stain becomes removable.
(4) The tea and coffee stains can be cleaned with help of hydrogen peroxide and ammonia. You can mix hydrogen peroxide with flour to clean greasy stains on granite tiles.
In conclusion, you can maintain the life of your granite tiles by utilizing the above care and maintenance tips.