How to Clean Marble Floors

Why grit is the real enemy

Sand and dirt act like sandpaper under shoes. The Natural Stone Institute recommends dust-mopping interior floors frequently with a clean, untreated, dry dust mop. Place mats or rugs inside and outside entrances to catch grit before it reaches the stone, and check that their undersides are slip resistant.

If you vacuum, make sure the wheels and attachments aren't worn. Worn parts can scratch the surface. Put protective pads under furniture, and don't drag furniture or heavy objects across the floor.

Routine washing

1. Dust-mop or vacuum first, so you don't drag grit around with a wet mop.
2. Mix a pH-neutral cleaner made for stone in warm water, following the label's dilution. A few drops of mild liquid dish soap also work.
3. Mop with a damp microfiber mop. Don't flood the floor.
4. Change the rinse water when it gets dirty.
5. Dry the floor thoroughly with a soft cloth or a dry mop.

What never to use on marble

• Vinegar, lemon or any acidic cleaner. Acids react with marble and leave dull etch marks.
• Scouring powders and creams. They can scratch.
• Toilet bowl, metal or oven cleaners. Stone restorers warn these can cause permanent etching or color changes.
• Bleach mixed with ammonia. The combination creates a toxic gas.
• Wax or polish, unless it's made for your stone and finish.

"All-purpose" and bathroom cleaners often contain acids. Check the label for "safe for marble" or "natural stone" before using one.

When a spill happens

Blot it with a paper towel. Don't wipe, because that spreads the spill. Rinse the spot with water and mild soap, then dry it. Acidic spills (juice, wine, vinegar, soda) need attention fast, because they can etch even sealed marble.

Polished vs honed floors

Polished marble shows etch marks, dull traffic paths and scratches more than honed marble does. The cleaning method is the same for both.

"Clean and polish": when a floor has lost its shine

Cleaning won't bring back a shine that has worn or etched away. The Natural Stone Institute sends etched areas and deeper scratches to a professional stone restorer for refinishing or re-polishing. Avoid DIY polishing powders unless they're made for your exact stone, because the wrong product can make the damage worse.