I'm not sure it did any good. But, I stuffed a lit highway road flare down a
woodchuck hole, one time. And then back filled it with dirt.

The fence charger might work. Hope not to zap a neighbor, or a child.

Christopher A. Young
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I dont just use ammonia, I mix bleach with it.
The vapors will drive out anything. I dont know if I'd do this for a
house, but I have used it on sheds and critters that tunnel under my
driveway. I have had something large digging under a shed, and I just
used the bleach and ammonia for the last 3 days. I had tried everything
else, even dumped in some used anti-freeze. Everytime I fill the hole,
it came right back. I think this will work. If not, I intend to put
some plastic tent stakes on each side of the two holes , put bare wires
in the shape of a grid, and connect them to an electric cattle fencer.
I know that will stop them. I zapped a coon once with the fencer and it
never came back.