I don't have any suggestions other than to wash them a few times. I just wanted to say that I had major issues with our diapers smelling like bleach and I wasn't bleaching them at all. I noticed the same bleach smell when brushing my teeth and decided it had something to do with how the city was treating our water. It went completely away after about two months. Obviously, your diapers probably smell from the previous owner bleaching them, but there's a chance it's not.
Re: Used Diapers