sdandrea1 Triple threat out. Snap trap with Jiffy peanut butter, glue trap and a bowl of antifreeze. Placed in 3 different areas. Stand by for results.
Antifreeze is a bad idea unless you can put it in a place only the rats can access. You will end up killing cats, dogs and other critters. Also poison them and they might die in an area you can't reach them and they will smell for quite some time. Trapping sounds like the best option.