Hmmm....I have six (10 gallon tanks) with mice in them and have absolutely no odor at all.
Keep in mind that mine are in the basement and not closed off in a hot bedroom.
I use aspen bedding along with pine pellets mixed in (except for the cages that have newborn babies). I thoroughly clean their cages every Wed. and Sunday - I realize I only have 6 tanks so I can do this without too much hassle.
I hope you find a workable solution.