Liquid 'Vanish' in your washing machine used to be the bees knees for removing ball-point pen ink. I don't know how effective it might be these days, since Reckitt bought it over and messed about with the original formula.
If it's blue fountain pen ink buy an ink eraser pen and use the white end. It won't work for black.
For any other ball point pen type of ink try the cheapest baby wipes (the good ones won't do it) or 'Stain Devils' magic little bottle specifically for ink.