My son has 2 pet mice in a 20 long tank in his room and they stink! I can't even put it into word how bad they smell. He cleans out the tank 2 times a weak and scrubs everything (tank and toys clean) but the very next day, they smell again. We use the same wood chips I get for the chickens and I even bought some spray that you use when you clean the tank. He really likes them so I hate to get rid of them. He is the only one who doesn't notice the smell. I just put an air cleaner next to the tank, the glade plug in didn't touch the smell. Any ideas, is there any hope??