Tech tip for getting through the glue: clamp a utility knife balde in a pair of vice grips, and use it to cut through the glue. (Safety glasses are mandatory because there is a good chance that the blade can break. They shatter when they brake. If you are matcho, don't bother. Buit leather gloves come in handy if you're the type of guy who doesn't like hacking up the hands.)

If you can weasel it inside, make a pass or two. Next gently pry up on one side and keep slicing. Soapy water/glass cleaner works well as a lubricant and will make cutting easier. Keep slicing and prying gently and you should be able to get them off without damaging them.