I’ve used this product called GOOF-OFF which melts the glue some then use the razor blade with it. Maybe carefully applied Acetone or Alcohal with the razor blade. You need to loosen up that glue and still use the razor blade.
I used a razor blade, 3 hours and a bunch of charcoal lighter fluid to get one of mine off. It was so badly deteriorated it was falling apart in my hands.