Fill a large bowl with warm water.
Add 1 tsp. of liquid dish soap.
Dip a sponge into the soapy water, and squeeze out the excess liquid.
Rub down the marble surface with the sponge for general cleaning and dusting.
Go over the surface again with a damp cloth to clean off any soap.
Put on a pair of rubber gloves.
Soak a paper towel in 20 percent peroxide, and drop three drops ammonia onto the paper towel.
Rub the paper towel over any tough stains, like coffee or tea.
Go over the area with a damp cloth to remove the peroxide and ammonia.