The answer to 'why is my upholstery buildup' is that upholstery can accumulate dirt, dust, and oils over time, leading to a visible buildup. This is a common issue for furniture that sees frequent use or is in high-traffic areas of the home.
Some common causes of upholstery buildup include skin oils, pet dander, food crumbs, and general airborne dust and dirt. Over time, these particles can embed into the fabric, causing it to look dingy and discolored. Symptoms may include a noticeable darkening or graying of the fabric, as well as a rougher texture.