How do you remove sticker glue from a plastic surface?

Drano Max Gel works. It disolves...plus its safe for plastic

Better (much safer) answer: Assuming we're talking about the standard kinds of glue left over from labels and such, just use some oily substance. Oil, moisturizer, or even tissues containing moisturizer are often enough to do the job.

ANS 3 - Depends what kind pf 'plastic' and what kind of glue. Goo Gone is good, so is Lift-Off, for some glues on some plastics.