Sometimes, spot cleaning can cause a wet-looking ring or fading. It’s always best to have the entire piece cleaned by a professional. However, if you decide to clean on your own, check the cleaning code on your piece of furniture. (This may be found in the packaging information, under a cushion, or on the bottom of the sofa.)
On fabric sofas, blot (don’t rub!) spills as soon as possible with a clean, absorbent white cloth. Blot from the outside inward to prevent a ring from forming. If the upholstery fabric has a thick pile, you may try brushing the fabric with a stiff bristle brush. If you are going to treat a stain with a cleaning agent, test it ahead of time in a small, hidden area.
On leather sofas, most spills can just be wiped away. However, old stains can be treated with lukewarm water.