Yes. Tell them you’re glad they could be with you for (amount of time they’ve already been with you) and now it’s time to go. Tomorrow. Bye bye. No arguments, no explanations, no apologies. You’ve already been really nice. It’s their turn.
I think the collective was very helpful. I was actually asking, What’s the best way to get rid of a deadbeat houseguest? I know the answer. I really wanted to hear other opinions.