why can’t they take a hint?

so i live in Bangkok with family, when we were in Cambodia i met a younger man in his 30′s and his wife that is also in the 30′s, we got to know them because we had the same guest house area, so later on when we come back to our house in Bangkok at least 3 months later we receive call from them that they are heading to Bangkok for a bit then leaving for somewhere else, so what do we do? we invite them with open arms, when they arrived it was fine, i have to sleep on the couch because there is only a room per person (4), but yeah, i was fine with sleeping on a couch for 2 weeks while they wait to find a house somewhere in Taiwan, north Korea, or anywhere else, but this is the thing that really pisses me off, they have been here for 4 months now, they aren’t mean people but they don’t mention anything about leaving, they are dirty (they never do their own dishes and constantly leave bags around/dirty pieces of wrapping paper for meats) they never once cleaned up after themselves, i seen there room, it is disgusting, there is moldy food, at least 20 empty beer bottles, the half the bathroom has black mold on it due to it never being cleaned!, they are so dirty all the time. but the worst part is, the wife will always complain about small things WE don’t do! god damn audacity right there, things like "you should take the dog out" or "yeah, i don’t think you should do that" etc, I’ve had it with them, I’m sick and tired of cleaning up after them/letting them destroy the room they are living in, oh yeah! they are also hardcore atheists and they absolutely hate anything to do with god, I’m not very religious, but the things they say like "It’s completely stupid for anyone to believe in a invisible man that grants wishes!, what dumb fucks!" what should i do? the husband is nice, bit of a gaming nerd but nice, the wife is annoying me, shes still kinda sorta nice though, i tried giving them hints like "so are you guys planing anywhere to go?" the response was "no" what should i do that isn’t so harsh but will give the point to these impetuous people!
@ tiffany, this is one of the reasons it’s kind of hard to just go crazy on them (i might end up just cussing life crazy in their faces and go crazy on them) but still, I’m pretty passive when it comes to things like this, but they don’t own a house, and they don’t make much money, they remind me of teenagers that need to grow up. so i can’t just throw them on the streets, its confusing

Woah that is long… But dont worry I actually read it!:D If that was me I wouldve been like a bomb and went boom in their face if they keep on being that b*tchy. I would just say things like "Can you help me clean/wash the dishes I need to do something". Or just be straightfoward and say "Look. I know WE invited you here but it doesnt mean this is YOUR house. So at least clean up after yourselves and stop complaining about what I do cause its not like you can do it any better". And just tell them that they should start looking for a house and make up an excuse like its better to live in their own home or stuff like that.