How do I make a marble countertop shine?

It will only shine again if you wax it, use car wax. Baking soda to help remove stains.

Have you tried cleaner and sealer made for marble? I buy mine at Walmart.

probably scratched it....Marble is a soft stone made of calcium carbonate. It is easily stained, dulled, and scratched. ... Baking soda is alkaline, so you should only use it with caution. It is also a mild abrasive, so you need to use it gently. Glassy marble gets its shine from vigorous abrasion, similar to the way wood becomes smooth when it’s sanded. When once-shiny marble turns dull, the culprit is often etched damage from acids, such as vinegar,fruit juice, or improper care using harsh cleaners. Some shiny marble has a topical shine product to enhance its luster. If this wears off, the natural, slightly duller surface of the stone emerges.

Unsealed Marble

If you know that the marble has never been sealed, an application of shine-enhancing marble sealer should perk up the surface and help it shine. Sealer is a liquid product that’s applied using a sponge, although some sealer manufacturers might recommend a proprietary applicator. Read the label before you buy; some sealers leave no sheen, and only penetrate to protect the stone.

Previously Sealed Marble

Marble with an unknown past might need the attention of a pro. Sealers penetrate slightly, and a new coat might not bond with an older application. Marble polishing powders make glassy marble seem possible, but these products might only produce a soft sheen. A professional restorer can grind the marble and buff to a shine. Another option is a topical shine product. This sits on the surface of the marble and dries to a shine but can wear off quickly.

I would use rubbing alcohol to remove residue. Then, try a store-bought natural stone seal and shine. In the future, always use an alcohol based cleaner for natural stone like the one in this video: https://chemistrycachet.com/the-book