在有污渍的地方喷点水。 涂双氧水。

Given the above summary, write a detailed text in English for it.
Pour a little hydrogen peroxide over the stained area. Cover with plastic wrap and let it rest for twenty-four hours. Lift the plastic wrap and wipe away the hydrogen peroxide with a damp cloth. Repeat if necessary. Be careful with this method if your marble is dark in color, as hydrogen peroxide can lighten marble.