Do not use abrasive cleaners, harsh or acidic chemicals as they may dull the finish. Avoid cleaning products that are not specifically designed for marble, limestone or travertine.
Grout stain removal guide:
Grease and fats
Soda and water or commercial spot-lifter
Inks and dyes
Household bleach
Blood
Hydrogen peroxide or household bleach
Coffee, tea, food, fruit, juices, lipstick
Neutral cleaner in hot water, followed by hydrogen peroxide or household bleach
Apply grout sealant with a small brush to reduce grout staining, taking care to keep the sealant off the tile surface.
Clean counter top tiles with a damp cloth and remove accumulated film with a soap-less, non-abrasive detergent or tile cleanser. Use a mild vinegar and water solution to remove grease and soap scum. Keep white tile seams clean by brushing with diluted bleach in a well-ventilated room.