Immediately identify the type of ink (ballpoint, felt tip, or another type of ink). A permanent ink cannot be removed. Refer to a dry cleaner for professional help. Even ink that can be removed is tricky. Do not dilute or sponge with water. This can cause ink to “set" permanently. Instead, proceed with caution as you pre-treat the stain.
Place the stain face down on paper towels. Spray aerosol hairspray on stain or apply denatured alcohol to back of stain. Replace paper towels frequently. Rinse with cool water.
Use a Dynamo and the hottest water safe for the fabric. Use chlorine bleach if care label allows; otherwise, use Sard Wonder Stain Remover.