I hope this isn't too late to be helpful. I recently stumbled across a helpful way to remove glue. ACETONE based nail polish remover (make sure it's not the non-acetone) will dissolve glue spots. I had several on my son's tiger sweatshirt. I poured about a capful onto each one, let it soak in for 10 minutes or so, then threw it into a warm wash. I might have had to do it a couple of times, but the shirt came out great with no fading or bleaching, etc. At this point, unless you can sew over it, you really don't have a lot to lose if you try it.