Why professional area rug cleaning is a different trade
A wall-to-wall carpet is fixed to a floor and cleaned from the top. An area rug is a free object with a face, a foundation and a fringe, and in a hand-knotted rug those are three separate materials that respond differently to water. The dyes may not be colourfast; the foundation may be cotton that browns when it dries slowly; the fringe is usually the original warp thread and is structural, not decorative. Cleaning an area rug properly means testing every colour in the field for bleed, controlling how much water enters the foundation, and drying the rug flat so weight and moisture do not distort the weave. None of this is possible with a wand on a living room floor, which is why valuable rugs are handled off site.