Lay the sweater out on a flat, heat-resistant surface such as your tub or sink.
Boil a pot of water on your stove.
Pour the boiling water directly over the red juice stain. Boiling water will easily remove and take the color out of red juice stains.
Let the sweater dry completely on a flat surface.
Soak a clean cloth in rubbing alcohol.
Dab the alcohol on the red lipstick stain until it is gone. Be very careful not to spread the stain by rubbing too hard or by working it from the center of the lipstick stain toward the edges. Use a new cloth and more rubbing alcohol as needed.
Blot the area with plain water to rinse out the rubbing alcohol.
Dab ammonia on the stain with a cotton swab if you can still see it.