A variety of common staining agents, including food, beverages and dirt, can stain your carpet. Different stains require different cleaning agents, but you eventually can remove most stains with the proper cleaning product. Carpet discoloration, however, is a more elusive beast.
Carpet discoloration occurs when a section of carpet is darker or lighter than the rest of the room's carpeting. The National Home Builders Research Center notes that certain airborne particles, such as dust and smoke, can collect in a given area because of the way air flows through your home. Using this knowledge, you can remedy discoloration while also preventing it from reoccurring.
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Vacuum the discolored area well. While vacuuming often does not remedy the problem, it picks up any loose dust particles – preventing them from adhering to the carpet and worsening the discoloration.
Rent a carpet shampooer if you do not own one. Purchase an enzyme-based cleanser. Shampoo the discolored area with the enzyme-based cleanser. Let the carpet dry.
Examine the carpet after it dries. If the discoloration is still present but to a lesser degree, shampoo the area a second time.
Hire a professional carpet cleaner if the discolored area of carpet remains after shampooing. Professional carpet cleaners have access to equipment and cleaning solutions that the public does not. In addition, professional carpet cleaners have experience remedying carpet discoloration.