How to remove otterbox glue that got on my iphone 5 screen?

Removed screen protector from otterbox, i did not clean it off just left it on my iphone 5 now i've tried to clean it off but it doesn't come off is there anything i can use or just need a new screen?

Try to use some special spray

Normally alcohol will take most screen protectors glue residues. Just put some on a clean lintless towel and start cleaning. You can try glass cleaner, just make 100% sure that it does not contain ammonium, because that can discolor some types of colored plastic.