My darling daughter has invested in 2 male mice. Just over a week ago. (they live in their home in her bedroom as i really cant do small rodents with hairless tails) She cleans them out daily, but they do smell so. We use megazorb as bedding material, do mice make this smell usually, or has she got a particularly smelly pair? You mousie folk out there - help! How can she keep the smell down?