A clean marble makes a bigger difference than you'd think. Here's the most effective method, plus the mistakes most people make.
Marble is porous and acidic substances can etch it within minutes. Wipe up spills the moment they happen.
Use pH-neutral marble cleaner or a few drops of mild dish soap in warm water.
Use a soft cloth or sponge to wipe the marble in circular motions. Avoid abrasives.
Wipe with a clean damp cloth to remove all cleaning residue. Soap residue can dull marble.
Buff with a dry microfiber cloth to prevent water spots and bring out the natural luster.