I want to add that you might want to add a tiny bit of dish soap to your bleach solution to act as a surfactant. When I say tiny, I mean a drop or two.
I use peroxide to sterilize my dry seed, but I get a little frustrated because it gets foamy sometimes. I really want to try bleach like Royal suggests, but since I've never done it, I'm a little nervous. Most everyone else uses bleach. I don't know why I'm being a wuss about it.