I used to work in a scrapyard in my teens, and it had a problem with rats unsurprisingly.
Had one of those humane cage-type traps, came in one morning and found the biggest effin’ rat i’ve ever seen – completely filled the cage to the point the cage was bouncing around the floor.
With a little experimentation i found out that a large multi-truck battery charger and a couple of welding rods make a very effective execution kit for mr ratty 🙂
Next day we found out they had made a nest inside an old car seat on one of the shelves, didn’t want to stick my hand inside to get the sods out so i poured petrol on it and torched the thing in the middle of the yard..
..NOT my greatest idea, there is approx a dozen burning rats racing around the yard squealing like hell and i’m running around trying to kill ’em with a shovel!