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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.

When cleaning your patio, you’ll need to ensure the chemicals you use aren’t harsh enough to destroy the seal or stones. You can clean the stones with a mixture of white vinegar and water or soapy water and a scrub brush. Just be sure not to use wire brushes, as these can scratch the surface. 

In most cases, chipped or cracked granite can be salvaged, but it depends on the size and scope of the damage. For example, a pro can smooth out small chips on the edge with polish pads or an angle grinder, but a crack that runs through the stone's surface has little-to-no chance of being fixed easily.