While is sounds paradoxical, having a maid actually makes the the kids clean up more. The fact that the maid puts things away in weird places, and toys get lost, motivates the kids to make sure that they know where things are before they get "cleaned".
Brock asked this morning if this was her day to come, as she only comes weekly. It wasn't, so he didn't clean up, but that's okay. You could see that the seeds of motivation are there, and that he recognizes that others (at least the maid) cleaning up for him, might not be in his best interest.