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Yes, baking soda does shine marble. Sprinkle it directly on the marble and let it sit for about five minutes, then wipe it clean with a damp microfiber cloth. If you’d like to make a baking soda paste, then simply mix the baking soda with equal parts water and apply it. You can also add baking soda and dishwashing liquid to a bucket of warm water and mop a marble surface.

Yes, limestone often turns yellow over time when improperly cared for. The stone contains natural iron deposits, which can oxidize when exposed to water, acids, or harsh chemicals, such as bleach. Without exposure to water or chemicals, limestone should not turn yellow. Always seal limestone countertops to protect them from moisture, and only use gentle cleansers designed for stone.

You don’t need to seal German smear; the mortar is already acting as a sealant for the bricks. You can seal the mortar, though, if you wish to further protect the area from stains, moisture, and dirt or make it easier to clean and maintain. Note that a sealant will make the mortar appear more glossy.

Routine sealing, avoiding heavy loads, and proper drainage improve lifespan. Regular inspections help catch and remedy problems early.