The answer to 'why is my upholstery buildup' is that there are several common causes, including dirt, oils from skin and hair, pet hair and dander, and dust accumulation. Over time, these particles can become embedded in the fabric, causing it to appear dingy and discolored.
The symptoms of upholstery buildup include a dull, faded appearance, a rougher texture, and stains or discoloration. In severe cases, the fabric may even start to deteriorate. While some light cleaning can be done at home, it's often best to call in a professional upholstery cleaning service to properly deep clean and restore your furniture.