Well....you're the exception, not the rule Dawn. Your cages are meticulous and are able to be so because of their set up. Walk into my barn. It doesn't matter if the cages are freshly cleaned or not. There is still an odor.
I use a plug in in my house, either the living room or the kitchen, and sometimes the bathrooms. I don't put one near the chins, the birds, or the rats. I would also never spray perfume near them. I hate perfume. I think it stinks and I hate when people bathe in it and subject me to it's nastiness; therefore, I would never use it near my animals. It hurts ME to breathe it in, I can't imagine how it would feel to them. However, I do use scented things in other parts of my house and I haven't had a problem with it either.