I finally hired an exterminator, becasue I had rats, mice, hornets, stink bugs and carpenter ants. I am 82 and widowed, my results were always temporary at the best. Iknow it is expensive, $125 a quarter, but all problems solved after only 3 visits, so worth the cost.
Not just the rats, but the carpenter ants were eating the big 2 by 10s that were the foundation of the barn. In order to take care of this I ahd to get up a ladder at least 12 feet or hire someone to do this. So, like I said, money spent very worthwhile. Have not seen one rat or mouse dropping for a year. Hornets controled and stink bugs gone for good. The bait stations are large black boxes and the they pomise that if one of my animals chews on a rodent tht got the bait, it will not harm them. Good luck, so far.