srnity: Did you guys know that as mice and rats travel through out your house,they leave traces of urine behind along EVERYTHING that they touch? ALOT OF URINE TOO.. So even if you don't "see" evidence of them,if they have been out and about..in you kitchen,which,if they were living in the fan,I think they ventured out a few times to look for food,every surface they touched had urine on it.Thats why,as cute as Gus-Gus was..I knew he had to go.