<human>: Can you provide a brief overview of the text?

I'm a guy that has been living with a group of girls for a semester now and I've got another semester to go before I can move out with a couple of my cleaner friends. Our flat has a joint living room / kitchen deal where the two rooms are essentially one. Since we moved in back in September I've had friends over once and cooked in the kitchen three times because the place was always too messy or the kitchen was in a state where I couldn't use it. They never clean up their mess and it's really gotten on my nerves. I don't want to live like this for another semester.

Before winter break I was the last one out and they left a sink FULL to the top of dishes as well as a few pots and pans for me to clean. Not one of the dishes was mine. I got back yesterday and they had gotten here before me but left to ski for a few days before classes started. There is a huge mess AGAIN that they left.

These girls aren't really my friends but I don't want to go about this in a way that will make me enemies. I know that I can't reprogram them and that they'll probably continue to be messy but any thing is better than this.
<bot>: My four flat mates make huge messes in my living room/kitchen. How can I get them to stop without being an asshole?