I was thinking about this yesterday when I saw a pizza box with the recyclable symbol on it. It's infuriating that intelligent people can't seem to understand that pizza boxes aren't recyclable after they've had pizza in them. What about oil soaked cardboard says "recyclable" to people?
Cardboard sandwich containers? Is there a go/no-go depending on how much mayonnaise had dripped out?
It's no surprise people are confused.