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Place a thin plastic wedge against the body of the vehicle directly above, below, or to the side of the emblem. Slide the wedge beneath the badge and into the glue. You may need to do it from multiple angles to loosen the emblem sufficiently. You can then either pry the emblem off, or use another method to cut through the adhesive in the middle. If you pry the emblem off, it may break. If you intend to throw the emblems away after, this method is fine. If you would like to keep the emblems, try using another method to cut through the glue in the middle. Cut a length of fishing line or dental floss that is about eight inches long. Wrap each end around the index fingers on each of your hands, then press the line against the body of the vehicle. Slide it down behind the emblem and pull the line to the left and right in a sawing motion as it passes beneath the emblem and through the adhesive. This method offers the best chances of removing the badge completely intact. If the dental floss breaks, cut another length of it and repeat the process until you are through. . You can also use a credit card in place of a plastic wedge or wire. Slide the credit card behind the emblem and continue to work it through the softened adhesive until it is loose enough to remove. Make sure to face the credit card out, toward yourself, so the letters don't scratch the paint. If you would like to keep the emblem, try to remove as much glue as possible before pulling the emblem off. Once the emblem is off of the vehicle, spray adhesive removed on the bits of glue that remain on the body of the car. Allow the adhesive remover to sit for a minute, then wipe the area clean with a rag. You may need to apply adhesive remover more than once to remove all of the glue.

Summary:
Use a plastic wedge to pry the emblem off. Cut the adhesive with dental floss or fishing line. Remove the emblem using a credit card. Spray adhesive remover on the leftover glue.