Dust the marble under the window with a damp microfibre cloth. Pour a few drops of the mixture and rub. The marble is now perfectly clean but if you also want to polish it you can take a woolen cloth and rub it vigorously on the marble. You will get a truly surprising result.

There are also other natural remedies for cleaning marble. For example, you can mix warm water and lemon juice in equal parts and clean the surface with a soft cloth .
If in addition to cleaning it you also want to make it shiny, use alcohol and bicarbonate . Pour 3 teaspoons of alcohol and 2 of bicarbonate into half a liter of boiling water. Pour a few drops of the mixture onto a microfibre cloth and rub. In addition to eliminating stains, you will have a plate as shiny as new.
As an alternative to lemon juice you can use vinegar . Dilute it with water in equal parts and rub with a soft cloth.
If after washing with natural ingredients you are still not satisfied you can resort to using pumice stone . Pulverize the pumice stone, place it on a damp sponge, rub the marble with circular movements, rinse with water and dry.