Press paper towels into the upholstery to absorb grape juice. Discard soiled paper towels, and continue this process until no more grape juice transfers to the paper towels.
Fill a small bowl with 1 tbsp. of white vinegar and 2/3 cup of rubbing alcohol.
Dampen a clean cloth with the rubbing alcohol and vinegar solution. Blot the grape juice stain to moisten it.
Lay a dry cloth over the grape juice stain on your upholstery, and press down on the cloth to absorb the stain. Alternate Steps 3 and 4 until the stain is completely removed.
Rinse your upholstered furniture by sponging it with a damp cloth, and then blot the surface dry with a dry cloth. Allow the upholstery to air-dry completely.