Carpet Stains Reappearing After Cleaning? Why Carpet Stains Reappear on my Carpet? Cleaning carpet is a mystery not only to the layperson, but those who are well educated. The fiber type, thickness, and other key factors muddies the water when it comes down to job well done. One of the biggest mysteries as to why carpet stains return typically involves three main reasons: Fiber type, re-soiling and uric salt. As the owner of EverClean Nashville, a professional carpet cleaning company in Nashville, TN , we've had our share of customer complaints that involved stains returning shortly after our service. Luckily, we have a 30-day stain guarantee the assures our customers we'll take care of those stains without pause, but the question remains, why do carpet stains return after removing them? 1. Carpet Wicking If you have any polyester clothing, and you've ever spilled mustard on it, you were likely surprised when the stain vanished after you washed it. This is because polyester...