Does anyone know a reliable cleaning service in chicago? I am looking for someone to come in like once a week and clean when we're not home, which makes me a little nervous. Can anyone recommend me one?

Have you tried Merry Maids?  I think since they're a big name, they should be pretty trustworthy...

i agree with lizzie, or molly maids. same deal, they're a big name and i think they have to do background checks and such.