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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.

Avoid using abrasive cleansing powders on natural stone, as these products could damage the porous material. Using bleach is also a poor idea because of the porosity of the stone. Avoid using a scrub brush with metal bristles, as they could scratch the stone. If you know who manufactured your stone or who installed the fireplace, you may want to contact that entity for any advice on cleaning it safely.

The best cleaning method to use for your project will depend on the specifics of that project. However, sandblasting does come with the risk of damaging the surface you’re trying to clean. One safer alternative to sandblasting is laser cleaning, which can remove many of the same contaminants with a lower risk of damage and a lower overall cost.

Use pH-neutral cleaners specifically designed for stone surfaces to clean granite or marble. Avoid acidic or abrasive cleaners that can damage the sealant or the stone itself. Regular re-sealing helps protect the surface from stains and damage.