I gave my daughter an old cabbage patch doll of mine and she has somehow transferred a drawing of her's to the head on the doll. So, now there is a purple ink stamping of her drawing on the head. I have tried milk, alcohol, fingernail polish remover, household cleaners, soap and water... Any other suggestions that would not harm the plastic on the dolls head to remove this? Nothing has made the stain even fade! Thanks!