What should you be concerned with when hiring a janitorial or cleaning company when you have natural stone? First and foremost, always ask the prospective cleaning professional if they have been specifically educated in natural stone maintenance.
By far, one of the most common causes of damage to marble and other calcite-based stones is the wrong cleaning product has been used on or near the stone, which resulted in etching—sometimes so severe there is nothing that can be done, short of having a restoration contractor mechanically polish out the damage.
A properly trained cleaning professional will know which products to use and which to avoid. They should also know to look for and recognize various potential problems and be able to point them out to you before they become serious. Janitorial companies trained in natural stone care will know the techniques and products to use to preserve and maintain polished marble floors. Some also include sealing in their menu of services.