Spots of ink are often difficult to remove. To remove them you should immediately scrub with soap and water. That is not sufficient, you can also use diluted bleach. Note that the color fastness of the material!
Ecoline in clothing can get out with milk. Place the stain or the entire garment in milk, after a while the stain is gone.
Ecoline stain wet (hot or cold water) and then rub with Ossegalstick, brush, and rinse in the washing machine with normal washing.