There are certain products to avoid around marble, limestone, onyx, terrazzo, and other calcium-based materials. Acids are one of marble’s biggest enemies. When I say acids, that can mean many common products like orange juice, lemon, cola, milk, tomato, mustard, vinegar, and much of everything we consume. Of course, strong alkalines, such as highly ammoniated window cleaners or oven cleaners, can also be detrimental to certain materials too. And as expected, these blemishes usually must be...