There is the gum in the hole of said rodent run. Didn't work, that I saw, but maybe I chewed the gum too long...
The cats are somewhat effective, but Mom and Dad don't have a cat, and well, they go off duty at least part of the day...
Husband smoked them out with propane. I think that actually worked. But, really, I get more than a bit freaked out when he decided to LIGHT it, and FLAMES and SMOKE come from the ground, like we are living near an active volcano.
A pistol works. However, when spouse A uses said pistol, (or shotgun, in one case), spouse B really should know, so that screaming and panic do not ensue when some unwanted rodent is dispatched...
(Dad, next time, let Mom know, pleeease?)
Then there is the little windmill thingy... It has such good reviews. Mom bought it, it is supposed to drive the little monsters off because the vibrations annoy them.
Ahem.
Well, the one my Mom bought must have been tuned by the Beach Boys for Good Vibrations, because when I came over about 3 days later, there were little mole hills all over, right by the windmill! It was attracting them!
Anyone want to buy a Pied Piper Windmill?