This is called carpet wicking the process of spots reappearing on carpets and rugs sometimes just days after you thought the stain was gone for good.
Carpet wicking definition.
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Directions for large areas.
Carpet wicking is the culprit for reoccurring brown spots.
Wicking is the upward migration of moisture or other substances during drying.
Carpet browning is a directly related to the process of wicking.
A carpet stain is like an iceberg.
The deeper parts of the fiber then push that moisture upward through evaporation to the surface.
Without replacement of pad and cleaning and sealing of subfloor wicking may reoccur with next deep cleaning.
Wicking is when the carpet gets wet from cleaning and the deeper parts of the carpet fibers absorb all that excess moisture.
Here is an explana.
Have you ever spot cleaned a stain from your carpet just to have it reappear.
Wicking is the visible tip of the iceberg that indicates the stain is still present below.
Wicking happens when moisture and cleaning agents move from the base of the carpet fibers upward to the tips of the fibers and bringing any hidden or embedded dirt from the bottom of the fibers with them.
Wicking is the result of soil trapped in carpet padding or subflooring that moves to the tips of carpet fibers as it dries after cleaning.
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Here is an explanation of why carpet wicking happens and what you can do to prevent and clean wicking should it happen to you.