I took various homemade mix recipies from a few breeders and compiled the good parts into my own. I could PM it to you if you'd like. =)
Male rats can be a bit stinkier, but if littertrained, like my boys are, its not a problem.
Male mice might be a bit stinkier, but I'm unsure. My two males taught themselves to do ALL of their bussiness in just one corner of their cage, so they're litter trained, also.