How to Clean Natural Stone

Daily Care

Daily cleaning of natural stone surfaces is generally straightforward and focuses on preventing dirt and grime buildup.

• Regular Wiping: For countertops and other frequently used surfaces, wipe down with a soft cloth or sponge after each use.
• Dust Mopping: For interior floors, frequent dust mopping with a clean, non-treated dry dust mop is recommended to remove sand, dirt, and grit, which can be abrasive and scratch the stone.
• Spill Management: Blot spills immediately with a paper towel. Do not wipe, as this can spread the spill. Flush the area with water and mild soap, rinse several times, and dry thoroughly with a soft cloth.

Deep Cleaning

When daily care isn't enough, or for periodic maintenance, deep cleaning is necessary. The approach depends on the type of stone and the nature of the grime.

• pH-Neutral Cleaners: Always use pH-neutral cleaners specifically designed for natural stone, or a mild liquid dishwashing detergent mixed with warm water. Products like Simple Green All-Purpose Cleaner are suitable for weekly cleaning.
• Application: Apply the cleaner with a soft cloth or mop. For stubborn areas, a soft-bristle brush can be used.
• Rinsing: Rinse the surface thoroughly with clean water after washing to prevent film or streaks. Change rinse water frequently.
• Drying: Dry the surface completely with a soft cloth to avoid water spots.
• Soap Scum (Bathrooms): In wet areas like bathrooms, minimize soap scum by using a squeegee after each use. To remove existing soap scum, use a non-acidic soap scum remover or a diluted solution of ammonia and water (1/2 cup ammonia to a gallon of water). Avoid frequent or overuse of ammonia, as it can dull some stone types.
• Algae/Moss (Outdoors): For outdoor pool, patio, or hot tub areas, flush with clear water and use a mild bleach solution to remove algae or moss.

Products to Avoid

Certain cleaning products can severely damage natural stone due to their chemical composition.

• Acidic Cleaners: Avoid products containing lemon, vinegar, or other acids, as they can etch and dull calcareous stones (marble, limestone, travertine). This includes many common household cleaners.
• Abrasive Cleaners: Scouring powders or creams often contain abrasives that can scratch certain stones.
• Harsh Chemicals: Do not use commercially available rust removers or toilet bowl cleaners that contain hydrofluoric acid (HF), as this acid attacks silicates and can damage all stone types, including granite and quartzite.
• Bleach and Ammonia: Never mix bleach and ammonia, as this creates toxic and lethal gas.

Cleaning by Stone Type

While general rules apply, some stone types have specific considerations:

• Marble, Limestone, Travertine: These are calcareous stones and are highly sensitive to acids. Always use pH-neutral cleaners. Promptly clean acidic spills like wine, coffee, or citrus juices to prevent etching.
• Granite, Quartzite, Slate: These are generally more durable and resistant to acids than calcareous stones, but pH-neutral cleaners are still recommended to protect any sealants and prevent potential damage to trace minerals. Some slate types may benefit from specific oil-based enhancers to maintain their color.
• Soapstone: This is a non-porous stone and typically does not require sealing. It can be cleaned with soap and water.

Tips

• Always test any new cleaning product in an inconspicuous area first.
• Use soft cloths, sponges, or mops; avoid abrasive pads or brushes.
• Ensure proper ventilation when using any cleaning solutions.
• For persistent stains or extensive damage, consult a professional stone care specialist.
• Regular sealing (as per stone type) will make cleaning easier and provide an extra layer of protection against stains.