I really hope I never get any guests that get upset because there are leftover condiments.
I notice when there are some leftover items then the next guest is likely to leave their items behind too. But when fridge is empty then everyone throws away perfectly good items.
I just recently added to my departure checklist: “You can leave leftover condiments/goods if you think the next guest may find it useful” - Interesting the next guest left several unopened bags of lettuce/spinach, ice cream, 15 eggs, a cut up cantaloupe in sandwich bags, an open box of cookies, and an unopened container of individual Honey Nut Cheerios.
I will leave the cereal since it is closed container - I think most people in general do like knowing that someone will eat their leftovers versus just throwing away in the trash - it’s too bad some people consider it filthy.
But then again, those same people probably use the nasty ketchup bottle that ten snot nosed kids touched before them…it’s amazing what grosses some people out…lol.