Moving forward give a time limit for the next managers you have in place. Mine for example has 2 weeks to get out when employment terminates by choice or by force, as well as a no further allowed on property owned by my company clause.
Proper eviction proceedings will probably be your route assuming you have given them written notice to vacate and state standard guidelines for move out as if it was eviction termination. Never do it verbal. Always keep a copy and date and time stamp everything you hand out to everyone. Give them a reasonable time to move. If they have been there a while, 20-30 days is sufficient to get out if its not on paper anywhere. If you are quazi-amicable with a time line, they are less likely to cause you further home damage because they are still in there, they could cause a lot of damage.