We often find that guests leave behind things like eggs, milk, open bottles of soda (2 liter), fruit and condiments.
We don't like throwing everything out and will keep eggs, mostly full and unexpired milk and condiments, but fruit attracts bugs if its not eaten and open soda goes flat. I think guests feel they are being helpful by leaving goodies for others, but it sometimes just creates waste. We can't donate open items and our local food bank doesn't take fruit unless it comes from your own garden or farm.
What do you do with the food guests leave behind?