Dirty house mate - make or break

Hey guys, I moved into a house with an old 6th form friend thinking I knew the guy - turns out I don't know him as much as I thought. The sins - Dishes left for 5 days, crumbs everywhere, stains all over the hobs, food cartons galore. Leaves the bath covered in hair and dirt, leaves used cotton buds in there and has probably never cleaned a toilet in his life (if he did it must have been a past life) Hoovering and mopping doesn't get done despite hints (left the hoover and mop bucket out for a week and the only change was the dust gathered on it). I've tried talking to him about it using the humor approach, then the more serious talk and it turns out the only way to get any sort of movement on the issue is to lose it; that's normally when the dishes get done. His response normally when I say ''the kitchen is a crap hole'' is ''don't worry about it'' - or if I say ''thanks for the dirty cotton buds on the side of the bath'' the ''oh I forgot'' response is fairly normal - this winds me up slightly more - hence eventually the lose it approach gets used. I hear you ask ''surely you knew what he was like before you moved in'' - in short yes I thought I did. He'd tidy and clean at his parents often, even doing my dishes when I lived in my own flat after a ''heavy night''. It seems though that after finally moving out of his parents into his first new house he has completely given up on the idea of cleaning. He either deliberately tried to make himself out to be cleaner before we signed the tenancy - or is genuinely showing the stereotypical mummy and daddy aren't here anymore to look after me - or tell me to do the dishes signs. (I'm 25 and have lived independently for some time) I'm moving for uni in September and will be able to move out so I ask, is it worth trying to get him to understand that he needs to grow up (without screaming at him as he is a friend) and take responsibility for himself - or shall I just cut my losses and let the next poor rentee he shares with deal with it in order to salvage something out of the friendship. Thanks!

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