When stain resist carpet came into existence many yellowing discolorations appeared especially after cleaning.
Carpet yellowing after cleaning.
Step 4 hire a professional carpet cleaner if the discolored area of carpet remains after shampooing.
If the spots are dry skip this step and move on to step 3.
You can remove the stain using an acid rinse extraction cleaning isopropyl alcohol vinegar and citric acid among other methods.
Another possibility is that the owner has been using some type of high ph spot remover which could turn the carpet a brownish tinge after cleaning especially with a high ph traffic lane cleaner being used.
You can reverse this by having the carpets cleaned professionally.
Step 2 use a wet vacuum to suck up the water and cleaning solution left behind from the previous carpet cleaning.
One of the causes of this discoloration is a condition called cellulosic browning.
Carpet can turn yellow from normal stains chemical stains or phenolic yellowing.
Application of after market stain resisters in the hands of the carpet cleaner will still cause yellowing or browning.
The gas gets trapped under the rug instead of dissipating into the air.
O ccasionally a brownish discoloration appears on a carpet or rug after it has been cleaned.
The carpet cleaner pitch to consumers of on site stain resist treatment is simply a hyped sales gimmick to.
This is basically a reaction that your carpet has all the time if it has butylhydroxyltoluene or bht in the carpet padding or glue.
You need a low ph acid cleaner of about 2 0 to safely remove the brown discoloration from your carpet.
The other affect that you might see is called phenolic yellowing.
Spread kitty litter over the carpet.
If the discoloration is still present but to a lesser degree shampoo the area a second time.
This is very prevalent with rubber backed rugs.
It was traced back to the cushion and pressure from the mills put an end to it.
It should soak up the moisture from the carpet along with the nasty smell.
In order for this discoloration to develop several factors must be present a cellulosic fiber moisture and slow drying.
Place one or two dehumidifiers in the room.
Professional carpet cleaners have access to equipment and cleaning solutions that the public does not.
This in turn causes the fibers of the carpet to turn that yellowish or tan color.
The technical reason is that bht butylhydroxyltoluene which is a preservative used on the backs of many area rugs will let out the bht gas.
Pour borax over the smelly areas and with the use of a dry brush or a soft broom scrub it in the carpet.