Disgusting smell on the floor will not go away!?

We live in a small apartment. There was, what we think, a spill of chicken juice from a bag of frozen chicken. We didn't realize it until about 24 hours later and the kitchen smelled like something DIED. It wasn't coming from the fridge, the sink, or anywhere that made sense. We realized it must be the floor. We have washed the floor about four times but the smell is still around. The windows have been open with a fan for ventilation. This has only brought in the flies and gnats. I think they are still attracted to the floor! We've been washing with comet and pine-sol and a sponge. The garbage is emptied, nothing else is sitting around. What else can we do??