Moisten a nondyed cloth with rubbing alcohol and dab it on the resin stain. Dissolve as much resin as possible.
Examine the couch for remaining resin. If any resin lingers, moisten another cloth with turpentine.
Blot the resin with the turpentine. Remove as much resin as possible.
Prepare a detergent solution for eradicating any remaining pine resin residue. Pour 1 tablespoon of liquid, nonbleach dish detergent into a clean pail. Mix in 2 cups of cool water.
Moisten another cloth in the solution. Dab the resin stain until the remaining pine resin is gone.
Dampen another cloth with cool water. Blot the cleaned area to rinse out all rubbing alcohol, turpentine and dish detergent.
Blot the area with a towel to absorb all excess moisture.