1.) Spray WD-40 on the edge of the reflector
2.) Heat it up with a hairdryer from inside the bag (low heat for about 1 minute)
3.) Pull off with a twisting motion or pry it up with a dental pick or floss.
4.) Clean off residue with WD-40, goo gone, or rubbing alcohol. Clean off WD40/goo gone with soap/water, rubbing alcohol or plastic cleaner...

Piece O cake...