Ok after getting rid of the front face of the sticker i was left with a huge glue blob on the window. I didnt have any goo gone so i got an antiseptic wipe and after 5 minutes scrubbing it came off! So if anyone has the same problem just use that.
I dunno i just had some antiseptic wipes. Its a mixture of alcohol and other crap. You could easily find some at a chemists even your local supermarket probably.