i have found that there are a couple tricks that will work.
1) use the fishing line like was mentioned. It doesnt break as easily as floss.
2) if you are using floss, take out a foot or 2. Wrap almost all of it on one finger on one hand, then just enough to catch on the other finger on the other hand. This way, as it breaks you can simply back some off the reserve finger.
3) Using GooGone. Once the relfectors/plastic item is removed, you can try using a thumb nail and GENTLY scraping off the foam part of the tape. Once the bulk is gone, soak the gluey spot with the GooGone. Hold a towel underneath the gluey spot to catch the excess GooGone. Let this sit for about 7-10 minutes.
4) after soaking, try using your thumb nail again to remove more of the foam. Resoak ... follow step 3.
5) after doing this a couple times, i use an old sock and turn it inside out. The inside is usually a rougher weave of cotton, and works like Brillo to take off the glue. Once the glue is broken up, i now turn the sock right side out and use the tighter weave of the cotton to give the area a good wipe down.
6) when all glue is gone, follow the area up with a cleaner. I use Simple Green and a clean cloth.
* should you drop your cleaning cloth, get a new one. You will catch the smallest piece of dirt, and then rub your clear coat raw scratching the ever living hell out of it. I did this to my 2000 Neon years ago .. and i literally looked like
** keep in mind the clear coat can scratch real easy. This includes using your finger nails. Be firm, but gentle.