Soiling can accumulate rather quickly on upholstery through use. It is transferred to the fabric from clothing, body perspiration and items placed on it, such as newspaper, food and drinks. Dust also settles on upholstery, along with airborne soils containing cooking fats or cigarette smoke. Many of these soils are tacky and will hold the dust to the fabric. In fact, the closer your upholstery is to the kitchen, the tackier the dust becomes and thus more harmful to the fabric. Combine that with the exposure of pet dander, dust mite accumulation and every day use, consumer groups therefore recommend cleaning at least every 12-24 months. If cleaning is postponed any length of time, fabric and colors can begin to dull, and the original appearance becomes more difficult to restore, shortening the life of the upholstery considerably.