Those are called soil “filtration lines,” which are created by soot from your furnace, and in some cases, candles. Nearly every home has them to some degree. It’s possible to remove them, but it’s very time consuming. It requires taping the molding with painter’s tape, treating the edges with a cleaning solution, working it in, steaming out with a crevice tool attached to our equipment, and repeating the process as many as 6 or 7 times. A single home can easily take 8 hours just working on filtration. This is available at an additional charge and requires a separate appointment. This is not included as part of our whole house special because of the time involved. Typically, when customers want this done, they will arrange to have us work on the high impact areas a set amount of time, maybe 2 or 3 hours.