Heres what works for me, If it's vinyl, just use your fingernail and some IPA, but if its metal, dental floss works good. Take the dental floss and work it back and forth between the emblem and the car. This cuts the 3M tape. Then use bug and tar remover to take off the 3M tape glue residue. Follow this by wiping down the area with IPA to get off the bug/tar remover solvents. Lastly, put on a good coat or two of wax.