The answer to 'why is my upholstery grimy' is that upholstery can become grimy over time due to a buildup of dirt, oils, and other contaminants. This is common for frequently used furniture, especially in high-traffic areas of the home. Symptoms include a dull, dingy appearance and a feeling of roughness or stickiness to the touch.
Some common causes of grimy upholstery include: daily use and body oils, pet hair and dander, dust and airborne particles, spills and stains that weren't properly cleaned, and infrequent vacuuming or cleaning. The best solution is to clean the upholstery regularly, either through DIY methods or by hiring a professional cleaning service. For heavily soiled or stubborn stains, it's often best to call in a professional to ensure the upholstery is cleaned thoroughly and safely.