How To Clean Acid Marks On Marble

Mamta asked, "How do I remove acid stains from marble flooring?"

Acid stains, such as by a toilet bowl cleaner or battery acid, cause what is known as etching on marble. These stains can be difficult to remove, but not impossible. If needed, a professional marble restorer can always be called to repair the damage.

Using Commercial Products

Using a commercial product to remove the damage is most likely to give you the best results.

You Will Need:

• A marble restorer OR marble polish
• Water
• A cloth

Steps to Remove the Stains:

1. Get a marble restoration kit or etch removing product. There are a variety available at home improvement stores. Look for products that specifically say they will remove acid stains or etching, such as Fila Marble Restore Kit.
2. Follow the instructions on the label of your selected product.
3. Another option is to use a marble polish. If using a powder, wipe some water over the marble, then sprinkle the powder over it. Moisten a cloth with water and use it to rub the powder over the stone until it shines. An alternative to polishing the stone by hand with a cloth is to use a buffing on a drill with a low speed setting.

Using Home Remedies

You Will Need:

• Baking soda
• Water
• Ammonia

Steps to Remove the Stain:

1. For fresh stains, sprinkle a generous amount of baking soda onto the stain.¹ The baking soda will neutralize the acid. Don't be alarmed if the area starts to bubble or foam; that is the effect of the acid and base mixing together and neutralizing.
2. If the stain is old, make a thick paste of baking soda with water and spread the paste onto the stain.² Allow the baking soda to sit for several minutes, then wipe away the paste and repeat if needed.
3. If the stain remains, moisten the area with diluted (10%) ammonia.³ Ammonia is also a basic solution, which can neutralize the acid.
4. Rinse the area well with water to remove any remaining residue from the ammonia.

Additional Tips and Advice

• Do not moisten the area with water before applying a basic (baking soda or ammonia) solution, as the water will reactivate the acid.²
• Borax can be used instead of baking soda if desired.⁴
• Scrubbing vigorously with baking soda could damage the finish of glossy surfaces.⁵
• Wear gloves and ventilate the area well when using ammonia. For more ammonia safety information, see Wikipedia.

Sources

1. Home Comforts; The Art & Science of Keeping House by Cheryl Mendelson
2. Stain Removal by Stephanie Zia
3. Baking Soda Bonanza by Peter Ciullo
4. Removing Spots and Stains by Ilbert & Elanor Mellan
5. Natural Stain Removal Secrets by Deborah L. Martin
6. Don Aslett's Stainbuster's Bible

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How To Clean Acid Marks On Marble

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