If you had caught it after the wash but before the dryer, most of the suggestions already given would probably have worked. However, once the stains have been subjected to the heat of the dryer, they are going to be pretty well set. You can keep trying, but I wouldn't hold out too much hope at this point.
I make it a religious practice to check every pocket in every garment that goes into the laundry as I'm putting it into the machine, and also to check each machine before I put any garments into it. With kids in the house, you never know what someone will decide to "hide" in the dryer or washing machine (or the oven, for that matter; I don't turn that on without looking, either.)