It's a favourite German pastime to drive to the Wertstoffhof (recycling centre) in your car to drop off the collected plastic for recycling. Now there are some

It's a favourite German pastime to drive to the Wertstoffhof (recycling centre) in your car to drop off the collected plastic for recycling. Now there are some bins where people can put some specific plastics like yoghurt cups (mostly cleaned by people, probably with a lot of hot water). Some are plastic foils with aluminium, styrofoam but most of it goes into the "mixed plastic" bins. There's all kind of stuff in it, some of it dirty. Who in their right mind would think that any of this mixed plastic stuff could be recycled?