If your vacuum has a steam function? Lucky you. Go slow over the fabric. It kills bacteria and fluffs up the fibers. But do not drench it. Sofas hate being soggy.
How To.Clean.Sofa
No steamer? No problem. Mix a tiny bit of fabric softener with water in a spray bottle. Mist the air above the sofa. Let it settle. This reduces static and smells like a laundry fairy visited.
Then, brush the fabric with a soft bristle brush. This lifts the pile and makes it feel new. Pet owners: this also grabs extra hair. Double win.