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Hydrogen Peroxide
Hydrogen peroxide, a chemical compound of water and oxygen, has different uses based on its concentration, including as an oxidizer, bleaching agent and disinfectant.
Purchase a 12-percent solution high-strength hydrogen peroxide at your local grocery store. Note that this method should only be used on light marble, as hydrogen peroxide can lighten darker kinds.
How to use it:
Pour some hydrogen peroxide over the stain. Then take a damp cloth and rub it gently so as not to damage the surface. The stain should disappear shortly afterwards.