Dust or dry-mop the marble surface first
Mix a few drops of pH-neutral dish soap with warm water
Dampen a soft microfiber cloth with the solution
Wipe the stained area gently
Rinse with clean water using a separate damp cloth
Dry the surface immediately with a soft towel
For organic stains, apply a baking soda and water poultice
Cover the poultice with plastic wrap and leave it until dry
Remove the poultice and wipe clean
For oil-based stains, apply a baking soda or cornstarch poultice
For rust stains, use a marble-safe rust remover
For ink stains, use hydrogen peroxide on light marble or acetone on dark marble
Test any cleaner on a small hidden area first
Avoid vinegar, lemon juice, bleach, and abrasive cleaners
Use a soft cloth or sponge only
Seal the marble after cleaning if needed