The answer to 'why is my upholstery filthy' is that there are several common causes, including regular use and wear, pet hair and dander, spills and stains, and lack of proper cleaning. Upholstery can become soiled over time from daily use, especially in high-traffic areas. Pets can also contribute to upholstery getting dirty with their hair, dander, and occasional accidents. Spills and stains from food, drinks, or other sources can also lead to a dirty, unkempt appearance.
In many cases, regular vacuuming, spot cleaning, and periodic professional upholstery cleaning can help keep your furniture looking its best. However, if the upholstery is heavily soiled or damaged, it may require more intensive cleaning or even replacement of the fabric.