So apparently we have rats that got into our ductwork. I smell them hubby doesn't. But I do see some evidence in some of the vents also. The ductwork is in the crawlspace. It has solid ductwork in the walls and that flexi-duct running the length. I'm leary of poison, because I worry about one of the animals getting poisoned from a dead rodent and dead rodents in the ducts. I have a snap trap baited with peanut butter tied to a vent cover with fishing line, but no one has messed with it. Anyone have suggestions on how to get them out and how to clean the smell from the vents?