I use lighter fluid to removed stickers without stretching them same as Del.
so how do you do this then please matey 
Pour on some lighter fluid to a corner, let it soak in for 30 seconds and peel the corner a little bit, then repeat until the sticker is off. Take it slowly and never pull the sticker too hard or it will stretch.
Do it outside somewhere and dont smoke a fag whilst doing it. Also watch your fingers go white from the lighter fluid.