We recently completed a carpet stain removal service in Saratoga, CA on a beige Berber carpet inside a master bedroom, and the before and after difference was dramatic. The stain was clearly visible against the light colored Berber. It followed a path across the carpet, likely from something being tracked through the room. On looped Berber, stains tend to sit on the tips of the loops but can also settle deep into the base of the fiber.