Let me tell you, those whales do not look good at all.. We had a "plastic whale" beach stranding here in Norway a year ago, and it was on obvious pain, so it was put down. When dissected, they found 30 plastic bags in its stomach. I'm not completely sure which species of whale it was, but it was about 6 meters long.

You can see pictures in this article by the Norwegian newspaper NRK is you are interested.