Marble is a very beautiful and resistant natural material used since ancient times because it is capable of enhancing domestic environments: one of the most chosen decorative stones to create stairs, tables, worktops, floors but also window sills, indoors and outdoors.However precious and luminous though it is, marble is a very delicate material, easy to blacken, yellow and get dirty, but also stains and scratches.Not to mention that, with the passage of time, it can lose its brightness and become opaque and that, being porous, it very easily absorbs liquids that accidentally fall on it.Washing marble, whether internal or external, is not as difficult as it seems, just follow a series of useful tips and understand which are the most appropriate methods to clean it without damaging it.With the right product, whose aggressiveness is to be chosen based on the type of stain to be removed, you can free the surface from any stain and opacity: in some cases, simply bicarbonate diluted with water may be enough, in others, instead , the stain must be treated with Marseille soap or with an alcohol and bicarbonate-based solution.It all depends on the type of stain to be treated.Before discovering the 10 most useful and effective tips for polishing it, removing stains and eliminating opacity, let's see which are the substances and foods that more than others can irreparably compromise the beauty of marble and damage it.Before understanding which are the most effective methods and practical advice for cleaning marble, polishing it and removing annoying opaque stains, it is good to clarify which substances are not to be used in direct contact with marble or to be limited in quantity. so as not to damage it permanently.Now that we are aware of which substances and foods it is absolutely not recommended to bring into contact with marble, let's understand how to polish stairs, floors, windowsills, but not only, and to remove annoying opaque stains.In fact, below you will find some practical advice and indications on which products to use to make the marble shiny and shiny.For the daily cleaning of marble you have several alternatives available;some remedies, however, are more aggressive than others, so carefully evaluate how to act based on the extent of the dirt, to avoid damaging your surfaces irreparably.We have ordered the following tips based on the aggressiveness of the products, starting with the least aggressive, in order to help you understand how to start and how to finish the cleaning based on the degree of difficulty of removing the stain, if more or less difficult to remove .All you need to breathe new life into blackened marble is a well-wrung, dampened surface cloth (excess water may stain the marble and ruin it instead of cleaning it).Dust accumulates easily on this type of surface, especially when used outdoors, for balconies and window sills: the result is a very unpleasant black patina.To eliminate it, simply wipe the surface with a damp cloth without exerting too much pressure to avoid scratching it.After passing the cloth, remember to dry thoroughly in order to prevent water from forming limescale and making the marble opaque.If, on the other hand, your marble has turned yellow due to the passage of time or prolonged exposure to the sun and other atmospheric agents, a more effective method is needed than a damp surface cloth.What you need in this case is some common hydrogen peroxide, capable of removing stains and making the marble shiny again.Just pour a few drops on a cloth and rub gently on the stain to be removed, to restore the marble to its original luster.But be careful: since it is a corrosive and dangerous substance, remember to dilute it with a little water and use a few quantities.In particular, it is not recommended to use it on black marble, because it could fade.An easy and home remedy to remove stain and polish marble is to use baking soda.Just dissolve a couple of tablespoons in a little water to obtain, thanks to the microgranules inside the bicarbonate itself, a non-aggressive abrasive paste to be passed on the surfaces.If the stain is not particularly encrusted and the dirt is superficial, this easy-to-find ingredient in the kitchen will be enough to get your marble back as new.If the stain on the marble is particularly encrusted, a wipe with a damp cloth is not enough, as well as hydrogen peroxide or the abrasive paste made with bicarbonate.A great ally of marble, in this sense, is Marseille soap, a natural detergent capable of removing stains from marble, eliminating opacity and cleaning it even from stubborn dirt.Go for soap in flakes or soap format.To use it just moisten it slightly and proceed with a wipe with a sponge, being careful not to rub excessively: the result will be immediate and you will not have to force yourself too much.Marseille soap can also be used together with baking soda for an even more effective effect.In the event that black marble has to be cleaned or hostile and particularly difficult stains have to be removed, the most effective solution is a specific detergent for cleaning the marble.Again, the advice is not to overdo the quantities.To be sure not to use a too aggressive product, read the composition carefully and evaluate the degree of acidity.This last aspect is essential because it is important to use a detergent that is not acidic.The suggestion, therefore, is to buy a delicate one, dilute it in the right quantities in a bucket of water and wipe it on the marble surface with a cloth, also in this case being careful not to rub too much.A specific product is, for example, polishing wax.Our advice is to try one of the following methods on a very limited and hardly visible space of the marble surface to be cleaned, in order to check the effects before continuing.This way you will avoid further damage to the stairs, the floor or the windowsill or any other floor made with this material as beautiful as it is delicate.Denatured alcohol is one of the most effective products for cleaning marble, especially when combined with bicarbonate, which is also capable of staining, polishing and also removing limescale.Therefore, it will be sufficient to create a home made detergent that is as delicate as it is effective with these two simple "ingredients" that are readily available.Then add the baking soda to the alcohol and, if you prefer, add a little Marseille soap.The compound you will obtain will be very useful for washing dirty, stained or dull marble floors, stairs, windowsills and tops.Using powdered pumice stone to clean dull or yellowed marble is one of the cheapest but effective methods.In fact, it manages to make marble surfaces shiny and bright as if they were new, effortlessly and quickly.This natural product, despite its abrasive capacity, is able to act as gently as effectively, simply making a paste based on water and pumice powder at home.Once the mixture has been made, just take a sponge and dip it inside, squeeze it and wipe it gently on the area to be treated delicately.Once the operation is completed, the suggestion is to eliminate the mixture by passing distilled water over it and, subsequently, carefully drying the top.Pumice stone also acts on encrustations and stubborn stains that can form on marble floors, windowsills, interiors and exteriors, floors and stairs.In the event that the stairs, the floor, the windowsills or other marble surfaces are stained with acid, it is possible to act using sodium bicarbonate and Marseille soap.The first step is to sprinkle the castile soap on the acid stain and rub it gently with a sponge.It is then necessary to pour some bicarbonate, leave to act for a few hours and rinse with hot water.Even if it is a rare case, it can happen that on some marble surfaces, especially if present in the bathroom, mold stains can form.Fortunately, there is an easy and quick remedy to solve this annoying inconvenience too: in fact, it is necessary to simply prepare a solution consisting of water, salt and baking soda and rub it on the mold spot gently, using a cloth.The floor polisher is a machine capable of removing scratches, marks and stains and also acting effectively on stairs and marble floors.They work thanks to discs that spread the wax and, consequently, polish the floors, making them shiny again.The floor polisher is the ideal tool to preserve the natural brightness of the marble and is an indispensable tool to renew it when it gets dirty, stains or becomes dull.