Answer:
If the dye has dried, you need to get it wet so it can be diluted and rinsed out of the upholstery. Spray or pour isopropyl alcohol onto the stain and blot it with clean white paper towels. Do not rub or wipe the stain as this will spread it. Keep blotting until the stain is no longer visible.
You may blot it with water to dilute the alcohol or just let it air dry.
Good Luck with it.