if you go to halfrauds, they sell this "crazy sticker remover" it comes in a yellow spray bottle near the cleaning products (£5.00)". if you spray it on the glued area, leave it for 10mins. the window gets all misty.. then u can acctually wipe it off. I brought this product when i did mine. it worked a treat, i did this not long ago. this was 4 months after releazing that trying to take of glue with the tar remover/nail polish remover was too much effort and plus that took me ages to scrap off.