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[–] totallynotFBI ago  (edited ago)

On every block fill a room-sized pit (not something they can't climb out of, they're too smart for that) with sulfur hexafluoride. Bait the pits. The rats will stay in the pits and suffocate. Just clean out the pits every day and in not too long most of them will be dead.

Of course you'll be selecting for rats that don't like the bait, pits, or smell of sulfur hexafluoride so you'll still have to clean up the city but this will rid the city of rats in the mean time.