Sungloss Marble Co. is a wonderful company, and we have used them quite a number of times to clean the stone surfaces in our lobby and elevator areas for us. These are high traffic areas, and we ask them to work on these overnight, and they have been fine with doing that. They also clean a small area inside my office, and they come back the next day to do that work. Their employees are extremely professional and knowledgeable people. We recently had them do a poultice treatment on some badly stained areas, and it took quite a bit of work, but they really did a fine job on those surfaces! We highly recommend Sungloss Marble Co. They are the only company that we will use for these type of services!