Put a blowdryer to it and pull. Keep the dryer at least a few inches away though, and keep it in motion. It should melt the glue enough to pull it free.
Once you do that, you're going to need some goo-gone, great stuff. It will pull the remaining bits of glue off.
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Every time you think you've made it idiot proof, someone comes along and invents a better idiot.
?the end of our exploring, will be to arrive where we started, and know the place for the first time. - T.S. Eliot