飛ぶ鳥跡を濁さず
とぶとりあとをにごさず
Expressions (phrases, clauses, etc.)
see: 跡を濁す・あとをにごす
see: 立つ鳥跡を濁さず
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
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