"RInse out the coke can before you put it in the recycling! And the milk bottle! They can't recycle it if it has food residue on it!"
"Really?"
"No! It has to be clean when you recycle it."
"But..."
...but the recycling lorry that comes to us on a Tuesday also picks up from - what? - five hundred other houses? Are you saying that if a single one of them puts an unrinsed yoghurt pot in there, the whole lorry load has to be condemned? And if it's not quite that sensitive to Fruits of the Forest LoFat Dessert, how sensitive is it? How many unwashed tuna cans does it take to balls-up a whole truckload?
Surely the first thing they do with all that glass and plastic is wash it? I mean, there must be a washing process somewhere in the chain.
But if there isn't, then there's no point us being so conscientious about recycling - because it's absolutely certain that, every fortnight, someone in one of those five hundred houses will have lobbed in a half-empty tin of beans that's been in the back of the fridge for a fortnight....
"....but, that can't be right. Either that, or the whole thing's a con."
"Just rinse them out, alright?"