I have two six month old boys. They are by far the most fearless rats I've ever owned, but the other day I had a friend over for a few hours and now they are acting terrified most of the time. My suspicion is that they smelled my friend's cats on her, and that she left the scent behind in my apartment. It's been almost a week and I've done everything I can think of to dispel the scent- lit candles, vacuumed, opened windows. My boys are still acting just as petrified. Any thoughts on what I can do to get them feeling comfortable again?