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Use pH-neutral cleaners, avoid acidic substances, and reseal porous stones periodically to maintain their finish.

You can’t change the color of the stone, but you can update granite countertops without replacing them by painting them. Because granite is a porous material, you’ll want to seal them first before painting them so that the paint doesn’t hurt the surface. This is important because you don’t want to devalue your counters by damaging the original surface; even if you don’t like the color now, you or a new homeowner may want to remove the paint someday and return them to their original color. You can also cover them with 

No, you cannot use vinegar to polish marble. It is too acidic for cleaning or polishing and can etch the surface. Instead, opt for non-acidic cleaners made specifically for marble. Follow the manufacturer’s directions to ensure proper application and to protect the marble. However, a damp mop can be an effective marble cleaner when used appropriately and as long as moisture is immediately soaked up.

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.