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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. 

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. 

Unfortunately, the product Bar Keepers Friend won’t remove etching from stone countertops. In fact, it can make it worse. Bar Keepers Friend contains oxalic acid, which can cause further damage to natural stones like marble or limestone.

Unsealed granite is more susceptible to staining and other damage. Regularly sealing your granite countertops decreases the chances you’ll need to repair damaged countertops in the future. It also keeps it looking shiny rather than becoming dull over time. You can check whether your granite needs resealing by putting a few drops of water on the counter and waiting 15 minutes to see whether the water permeates the surface.