The answer to 'why is my upholstery greasy' is that your upholstery may have become greasy due to a buildup of oils, dirt, and skin residue from regular use. This can be caused by a variety of factors, including not cleaning the upholstery regularly, using the wrong cleaning products, or allowing pets or children to sit on the furniture without proper protection.
Some common symptoms of greasy upholstery include a shiny, oily appearance, a sticky or tacky feel, and an unpleasant odor. To address this issue, you'll need to thoroughly clean the upholstery using the right cleaning methods and products. For most DIY upholstery cleaning, you can use a mild soap and water solution or a specialized upholstery cleaner. However, for heavily soiled or deeply embedded grease, it's best to call in a professional upholstery cleaning service to ensure the job is done properly and your furniture is restored to its original condition.