How to remove sticky labels

[Andyhull]

I have around 60 Thwaits IPA bottles to strip but they have plastic labels on them with a none water based glue.
How do you remove the plastic label as it won't soak off, i tried to remove one and had to use a knife to scrape it off slowly
Any ideas as i dont want to throw these away as i have so many!

 

[GrumpyBunny]

I had a bottle with a plastic label on it and I was able to peel it off in one go. I did have to ease a corner up with a sharp knife and peel slowly.

 

[Jeltz]

Those are the type I use the WD40 on.