I've posted this before....
Shared house, 5 people, all young professinals, 1 utter pratt who never washed a pot or a pan and never cleared his food from the fridge no matter how green it got.
We suffered it for months. Cleaned up around him, for him, through him.
Then I lost my temper and became a bit of a control frea, wouldn't let anyne else clean up his stuff... then, when it got ridiculous, I waited for him to go to bed and stacked it all up against his bedroom door, leaning on it. All the pans and dishes with the greay nasty water and food remnants still in, minging food, wet nastiness shoved in amongst it all.
I forbade the others to remove any of it. I was, apparently, scary!
We all got up early and waited.... the noise was deafening: the crash, the gloopy noise, him screaming, then swearing, then threatening...
I told him he was a total cunt and deserved every splash of green nasty crap... on his shoes, suit, shirt, briefcase, bedroom carpet, bed..... the others cheered. He sulked. But in the 2 months it took him to move he never left a single thing in the shared area again 