I don't know about your mancats, but Devon and Tanner love to chew and/or lick plastic. We try to be careful and keep things put away, but we know one of them will let us know if something has been missed! Tanner's birthday toy came wrapped in plastic...I let him have fun for a few minutes before I cleaned it up. I don't know what the draw is to the plastic, but he seems to enjoy it a great deal!
Here's Tanner in action...enjoy!