i know this thread is a few weeks old but if your in the northeast today or tomorrow
just go out and give the reflector a little side ways push....

i just went out to my bike in the parking lot here at work and its so damn hot out
that i put light constant pressure on one side of the rear fender reflector and it popped right off so i grabbed the side red reflectors and turned them like you would a cap and they fell right off too and didnt even leave any residue.

 

yeppers my fork ones pulled right off, i did put a little heat on the fender and pulled them off, used a little wd40 to clean what little adhesive stuck to the fender

 

I.know this is old but I didn't want to start a new thread. Will wd40 or goo gone affect the denim finish?