Probably someone threw some bleach around after the bodies were taken away, before the cleaners arrived, since the smell of death is unbearable.I remember an article repeating workers saying something about a chlorine/cleaning product smell.
jmho ymmv lrr
If it's a choice between media reports alleging what was said by workers; vs a report by professional forensic scientists who worked the original scene, I know which one I consider more dependable for facts.
JMO