@ T-Bone
If I were you I would try to organise a two-week holiday somewhere. Then simultaneously organise to have the place fumigated, or the flooring sealed, or any arbitrary thing you can think of. The guest will have to go. Just say 'It's been real nice having you around, but I need to clear the house for fumigation and I know you are making job advances too. Hope you enjoyed your stay and good luck with your new job.'
