立つ鳥跡を濁さず (たつとりあとをにごさず): it is simply common courtesy to clean up after yourself; a bird does not foul the nest it is about to leave; on leaving a place, one should see that all is in good order

it is simply common courtesy to clean up after yourself; a bird does not foul the nest it is about to leave; on leaving a place, one should see that all is in good order

The departing bird does not muddy the water behind it. Standard advice on the way out of a job or a flat: leave it in the state you would want to find it.

A Japanese proverb (ことわざ)