Few methods:
1. To soften the letters and glue... either kettle of warm/hottish water OR hairdryer.
2. To remove letters... credit card slid in behind OR dental floss to cut through the glue
3. To remove left over glue... pencil eraser OR tar/bug remover and lots of rubbing.
Clean car and inspect, maybe need to polish in area where badges were. Looks really good when doen though. Will post pics later of mine sans-badges!