Sofas made of polyester fibre don't always withstand the moisture of steam cleaning or cleaning methods using excessive water. Other alternatives are readily available and economical.
Vacuum your sofa to remove as much debris as possible. Use a sponge designed for pet hair removal and dry-sponge the entire sofa. Even if you don't have pets this will help remove lint the vacuum may have missed.
Test the underside of a cushion with a little bit of the spray furniture cleaner. This will determine if it will disturb the colour with its usage. Following the manufacturer's directions, spray a small portion of the underside of a cushion and wait the allotted time. Spot clean the area with a damp sponge. If the colour doesn't run or fade, proceed with cleaning the couch as needed with the spray cleaner.
Stand the cushions near an open window or heating vent to dry after spot cleaning with the spray cleaner and damp sponge. This will prevent any type of mildew or mould from growing inside the cushions.
Freshen the polyester fibres in your sofa between cleanings by spraying a fabric freshening product like Febreeze. This will eliminate odours and add a soft, fresh scent to the entire room.
Avoid the need to clean your sofa by eliminating certain behaviours. Don't eat or drink while sitting on the sofa and keep pets off the sofa. These preventive measures will add years of life to your sofa. Despite the ease of spot cleaning, excessive cleaning can actually break down some of the polyester fibres.