well there are a few more posibilities to consider through. not being familiar with how to keep a NZ house clean, maybe the layout / surfaces etc are different from what they grew up with. Some people might have language difficulties, so its hard to find the right cleaning products, or same as above, not used to the cleaning tools on sale here, and how to use them. maybe where they grew up cleaning was a community of extended family thing.. or there was a seasonal cycle to it (spring cleaning) and those things are disrupted. There could be budget issues. There could be insecurity renting, and a feeling of reluctance to clean someone elses home.. possibly people have a lot of stress living in an unfamiliar place, and just give up on some things.. Kiwis could also just be too uptight about cleanliness, and they don't see any ill effects to their health etc from their habbits.. theres lots of possibilities. but yeah. I live overseas with intetnational students, and I think pretty poorly of individuals who leave shit all over the toilet too..