Marker out of clothes!?!

My aunt babysits my 14 month old son a few times a week while I’m at work. She lets him write on a dry erase board with dry erase markers. No biggie. He normally get a mark or two on his clothes and I just use a little stain remover before tossing them in the washer.... my SO did a load of my sons clothes(something that I normally do!!) and there were a few shirts I didn’t go through to stain remove. These are brand new shirts and now they’ve been washed and dried with marker on them 😭 any ideas on how I can get the stains out now!?!