Mate
If you get some Autobrite 'Tar + Glue Remover' spray onto the window sticker and leave it for a few minutes and it will make the sticker easier to get off..You should be able to get your finger nail behind a corner and lift it off..
A 500ml bottle of 'Tar + Glue' is £4.50 delivered maty.. Give me a shout if you need any..
Hope that helps??
Regards Mark
How about the removal of the newer type of dealer stickers? Its more like a transfer, when you try to pick a corner it just scratches, any ideas?