1. Has fast food/wrappers/dirty dishes in his room that have been there for more than a month and they only time they are cleaned is when the stench from his room starts affecting the entire apartment.

2. Uses other people's cooking utensils or pots and doesn't clean them or his own for periods of more than a month.

3. Washes his clothes maybe once a semester but perhaps less.

4. Has never cleaned the bathroom (and the responsibility falls on me everytime we have guests over so they don't vomit)

But recently the issue has reached a head because whenever he opens the door to his room you can smell the stench in the house for the next 5-10 minutes.

We have shared with him many many times our concerns and that we would not like rodents. Other roommates have also told him this and stated that they loved us but could not stand to be in the same apartment as him.

How do we get him off the lease and subsequently get him to clean up his mess before he leaves?

Or because he is my bf's friend how can we FORCE him to clean?

We really don't want to move (our apartment has a great view of the mountains and is in a great location)

As for getting him to move, I'm assuming you've asked him to move already and he said no? That would be the first step, if you haven't done it. If he agrees, then you talk to landlord about signing a new lease without him. Which, like colleen said, it sounds like something that's acceptable to landlord if you've gone through 5 roomies in 2 years...

As for getting him off your lease if he doesn't want to go, you probably don't have a lot of leverage, but it depends on your relationship with your landlord. If he is on the lease, the landlord is obligated to let him live there until the lease is over. That said, most leases require tenants to maintain the place in accordance with basic health requirements, which it sounds like he may not be doing, which would give the landlord (not you) a legal recourse for kicking him out early. However, most roommate-situation leases are also written "jointly and severally", which means you are all responsible for each other's behavior; if the apartment is bad enough that your landlord can kick out the roommate, he can also kick you out. Doesn't matter whose mess it is (or who hasn't paid their share of the rent, or who's making all the noise at night, etc). And it might be easier for him to just get rid of you all than allow himself to be dragged into the middle of a roommate dispute. But, if you have a friendly relationship with the landlord, you might be able to get him to kick out roommate only.

Or, you can forget trying to get rid of roommate on lease violations and just wait until the lease is up. Then, you can move. You can stay, and ask the roommate to move, but you can't force him to. (your landlord can) Once the lease is up, your landlord could choose to rent to you, to your roommate, or to none of you and just find a new tenant. Again, the landlord may be inclined to just get rid of you all rather than put himself in the middle of your problems, or if you are friendly with him, he may be willing to renew with you but not the roommate. (or if roomie is friendly with him, he may do the reverse, although that seems unlikely if your description of his hygiene is accurate).

Mediation. Many communities offer it at a very low price. If yours doesn't, it's still a good investment.