Blot any stains with a white cloth, being careful not to rub the stain into the sofa.
Look at the fabric on the sofa to determine the "nap." This is the direction the fabric is flowing.
Open the windows near the sofa for ventilation, and apply a dollop of mild cleanser, such as furniture shampoo, to the odorous area.
Brush the cleanser gently into the fabric with a soft brush, such as a baby's hair brush. Brush with the nap of the fabric.
Wipe the area clean with a soft cloth. Repeat the steps until the odor is gone.