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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.

It is advisable to have stone countertops inspected every few years, especially if damage is noticed. Regular maintenance and inspection help catch and resolve issues early, extending the countertops' lifespan.

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.

No, using a power sander on brick is not recommended because the force of the sander can destroy brick's fragile outer layer. Even using sandpaper on brick is discouraged because of the damage its abrasiveness can cause.