Since the device is confirmed not working, take a moment and test out something. The best way to clean the corrosion off of metal is to soak it in a shallow bath of distilled white vinegar. The blue corrosion should bubble and be removable in a few moments.
Clean it with a toothbrush and then give it a shallow bath in rubbing alcohol. Once you've done that, again, clean it up with the toothbrush and see what kind of damage you have to the traces and components. It could be savalagable or completely scraped but worth the good learning experience.
If you have time, give it a shot and see what happens. I'd be interested in finding out.