Generally, it is a bit tough to steam clean upholstery, because it has a thick and deeper area that needs a special kind of treatment. No worries, you can do it even with a garment steamer. The hot pressurized steam penetrates deeply and breaks down stains. As a result, stains and dirt loosen the grip and are easily dislodged. Follow the steps
Vacuum the couch before applying steam to suck visible debris and dirt.
If you have a pet at home, then remove pet hair with a lint roller.
Attach an upholstery tool with the steamer and apply steaming over the surface of the couch.