These are maintenance recommendations supplied by product manufacturers...
 

Basic Care Ceramic Tile is one product in your home that requires very little care; it is one of the easiest surfaces to keep clean. Most dirt will not even adhere to tile. Ceramic tile provides a unique combination of beauty and durability. Its hard, non-porous surface is a natural low-maintenance finish. Once properly installed, depending on the type of tile, it essentially requires little more than dusting and occasional damp mopping. NOTE: Standing water or other liquids can deteriorate tile and grout, and should always be removed. Regular Cleaning Glazed Tile   Walls/Countertops Wipe with a clean, damp cloth or sponge. For stubborn soil use either a window cleaning agent or an all-purpose liquid cleaner. Floors Mop on a mild solution of soap-less detergent in water. Rinse thoroughly Unglazed Tile   Walls/Countertops Wipe with a clean, damp cloth or sponge. Use a diluted solution of soap-less detergent for stubborn dirt. Floors Mop on a mild solution of soap-less detergent in water. Rinse thoroughly. In Wet Areas Glazed Tile   Walls/Countertops Use all-purpose cleaner on a soft cloth or sponge; wet down and allow to stand for 5 minutes; rinse well. Floors Use a soft cloth or sponge with an all-purpose cleaner or medium-strong solution of soap-less detergent. (if danger of fungal growth/athlete's foot is present, use bleach). Rinse well. Unglazed Tile   Walls/Countertops Use a sponge with a strong solution of all- purpose cleaner; wet down; allow to stand for 5 minutes; rinse well. Floors Scrub with an all-purpose cleaner or medium solution of soap-less detergent. (If danger of fungal growth/athlete's foot is present use bleach). Rinse well. Stains Removal guide To Remove Use Grease, oil, fats Solution of soda and water (or Club Soda) Organic or inorganic dyes Chlorine bleach - right away Fingernail polish Dissolve with polish remover. If stain remains, apply liquid household bleach. Rinse, then dry Inks and colored dyes Apply household bleach, let stand until stain disappears keeping the surface wet continuously. Rinse, then dry Iodine Scrub with ammonia. Rinse, then dry Mercurochrome Chlorine bleach Blood Hydrogen peroxide, chlorine bleach, or a chlorinated (bleaching) scouring powder Mildew Use Tilex cleaner or ammonia on tile. Scrub grout with scouring powder. Wash with bleach if needed. Rinse, then dry Water stains, soap buildup Ammonia, cleaner, and vinegar Chewing gum, wax, tar Use a wood blade (tongue depressor or similar implement) to scrape away bulk of material. Chill material first with ice cube to reduce smears and spreading. Remove remaining light residue with non-flammable paint stripper following precautions on label. Rinse, then dry Coffee, tea , food colors, fruit juices, bleach, lipstick Soap-less detergent solution, or all-purpose household cleaning liquid, then chlorine bleach Hard Water Stains Commercial tile cleaners such as Tile It are available at supermarkets, or use a solution of white vinegar and water, mixed in equal amounts. Test this method in a small area first to be sure the vinegar does not etch your tile or erode the grout. Vinegar can damage some tile glazes. Caution: Ammonia and household bleaches should not be mixed together.   Sealing The grout used to secure your tile may not be specially treated. If you find stains to be a problem, we recommend a clear liquid silicone be applied. Follow stain removal instructions (above) prior to application of sealers. Due to the curing time required for grout, this sealing procedure should be done 30 days or more after installation. Scratching Most tile used on countertops and vanities are glazed matte gloss and resist scratching. If yours is a high gloss finish, scratching is a possibility. Grout Normal settling will cause some cracking of the grout, particularly in corners and edges. This condition should be taken care of promptly. Your tile supplier can provide a siliconized acrylic caulking to repair initial cracks and to insure proper maintenance of the grout. Efflorescence (whitening of the grout) is caused by soluble salts settling in gray cement-based materials, or from grouting materials floating to the top. Clean with a grout and tile cleaner and rinse well for several days after cleaning. Crazing Crazing is the effect of fine surface lines appearing on glazed tile. It is caused by aging, heating, and cooling. Since tile is a natural product and reacts to its environment, this is considered a natural process.