use a heat gun to heat up the adhesive on the back.. about 2 minutes or so
use the heat gun in a left to right waving motion... so that the heat isn't concentrated on one spot for too long...
then while it's warm... use either fishing line.. or dental floss .l both work great.. and in a sawing motion.. work your way behind the badge..! until it's off... sometimes you'll need to reheat and then "saw" again..!!
after all is said and done... use "goo gone" to remove remaining adhesive... and a paper towel.... .. if you don't have goo gone... cooking oil works great too...
good luck
p.s. it's very easy..!!