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To remove cloudiness from marble, use equal parts baking soda and water to form a paste. Apply it to the surface, allow it to sit for at least two hours, then wipe with a microfiber cloth. Another option is adding a couple of dish soap drops to warm water and wiping the surface after you’ve applied it to the surface. You may also consider using a liquid stone cleaner.

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.

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 

Due to soapstone's non-porous nature and antimicrobial properties, you don’t need to seal it like other stone materials like marble or granite. However, even though sealing isn't required, it can enhance soapstone's natural stain resistance. Another protective option is to apply mineral oil once per month.