Try cash for keys. Have your attrorney draw up a letter offering to pay them a specific amount of money ($5K to $10K) provided they vacant the premises by a specific date and leave it undamaged. The letter should make it clear the money will not be paid unless everyone completely vacates and removes all belongings, animals and trash prior to the specified date and that an inspection after that date reveals no damage. Of course, give that they are already trashing the place, you will have to specify what amount of existing damage is acceptable.
The amount you pay may be cheaper than the cost, trouble and time delay caused by eviction.

