DD2 got two pet rats for her birthday. They are great success and we all love them as they are so sweet and friendly. However, they really whiff sometimes and it stinks her room out. She shares with DD1 and I feel it is a unfair on her. She cleans them out regularly and always uses pet cage disinfectant and this powder stuff that you add to the litter which is supposed to decrease odours but they still smell. They are males which I know are the smellier sex in rats but I was wondering if there was anything else I can do to reduce the pong?