I just removed some old faded rear boot OE stickers from my car (EA82 coupe) , I used a hair drier to soften them up, then scraped/picked off with my finger nail, once the plastic is removed the stickey stuff can be removed with a little meths and or cut off with a decent polish . Though I did start to accidently remove the good door 4WD TURBO stickers with the power wash! DOH:banghead:
Hope this helps
Michael