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

Like most stones, limestone should be sealed. Its porous nature makes it prone to staining from spills, and the iron in the stone can cause it to turn yellow when exposed to moisture or harsh chemicals. Proper sealing can help prevent these problems and protect the stone's appearance.

A water-based, low- or no-VOC sealer is typically a good choice for marble countertops. Choose a sealant that is certified safe for contact with food when applying to kitchen countertops. For high-traffic areas, look for formulas that have heat-resistant and acid-resistant features. While there are economical and convenient spray-on sealers, they don’t coat the surface as effectively as the ones you apply with a pad or brush. 

No, minor quartz stains are usually not permanent. Addressing spills on your countertop quickly can prevent the stain from worsening. Any remaining stains can generally be removed with a quartz-safe cleaner or a mixture of dish soap and water applied with a soft microfiber cloth. Severe stains may need professional treatment—and, in severe cases, countertop repair or replacement.