The answer to 'upholstery buildup' is that it is a common issue caused by a combination of dust, dirt, oils, and other debris accumulating on the fabric over time. Symptoms include a dull, dingy appearance, faded colors, and a rough or sticky texture.
To address upholstery buildup, you can try DIY cleaning methods like using a vacuum with a soft brush attachment, spot cleaning with a mild detergent and water, or using a fabric-safe upholstery cleaner. However, for more extensive buildup or difficult-to-clean fabrics, it's best to call in a professional upholstery cleaning service. They have the right equipment and techniques to thoroughly clean and restore your furniture without causing damage.