I've got an old aluminum tool case that will soon hold my jamma test rig. It had some pieces glued in place that I removed, but there is this hard, yellowed adhesive that I just can't easily remove. I don't want to use a heavy grit sandpaper if possible. Tried thinner, acetone, xytol, and a chisel. Have been using the blast cab but the stuff is really resistant. Any ideas?

