Remove water-based ink from fabric by placing the spot over a clean towel, adding water and blotting with another towel. Add laundry detergent to the stain before continuing to repeat the water treatment. The type of ink is often more important its color in determining success at stain removal.
Water-based ink is the easiest to remove. Once the stain is gone, wash the garment in the hottest water its care label allows. Always check for any remaining traces of ink before machine drying.
Ballpoint ink is slightly harder to remove than the water-based type. Place the clean towel on a protected work space and dab the spot with rubbing alcohol. Then blot with a second clean towel. If the alcohol does not remove all the stain, rinse it with plain water, blot it dry with a towel, and apply nail polish remover. Apply laundry detergent to the spot, allow it to soak, and wash it at the hottest safe temperature.
Permanent ink is the most difficult to remove and may never go away. For bleach-safe garments, wash with bleach to remove the ink. For garments that cannot be bleached, try the progression of rubbing alcohol and nail polish remover used for ballpoint ink. As a last resort, try pure acetone. Before using nail polish remover or acetone, always test the chemical on an inconspicuous spot on the fabric.