This is most often a result of wicking which will be discussed below.
Carpet cleaned then spot returns.
The good news is that if a spot actually wicks back it can be removed.
So it may come as a surprise when some of the spots return.
Now the remaining liquid will carry some of the spill back up to the carpet surface due to capillary action also called the wicking effect.
As carpet dries water evaporates from the tips of the carpet yarns drawing some of the remaining moisture behind it.
There are two primary causes of carpet re spotting.
Returning spots after carpet cleaning a manufacturing issue.
Wicking is one of the most common result of returning spots.
Other times the spots come back after several weeks have passed.
One originates below the carpet fibers in the backing or pad of the carpet.
After cleaning a spot or stain from your carpet there are times where it will return just shortly after the carpet dries.
Naturally you expect your carpets to look better after carpet cleaning than before.
Re soiling from various residues and soil wicking after carpet cleaning.
At other times the spots and stains come back after the passing of a few weeks.
There are two reasons that this can happen.
When the carpet is cleaned it looks good.
This is most often referred to as rapid resoiling.
Vigorous scrubbing could damage your carpet or upholstery.
These returning spots can be as much of a surprise to your carpet cleaning professional as they are to you.
These type of spots usually start out as a spill.
Do not scrub the area.
Using a white cloth or towel depending on the size of the stain gently rub the area back and forth or in a circular motion so the water based cleaning mixture covers the entire stain.
When it dries the spots and traffic areas come back.
When spot cleaning yourself place a folded white terry cloth towel over the spot just after you clean it while the spot is still moist.
Sometimes spots can reappear as soon as the carpet dries.
Another common reason for returning spots after carpet cleaning is residue in the carpet.
Say you use a fair amount of spot cleaner to clean up your spill and finish by blotting up the tips of the carpet fiber.