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They only need a hole about the size of a dime in order to get in. Finding and plugging all the holes that small and larger is a tall order.I have not found a good answer to this. Even blocking everything you can think of they still seem to find a way. For whatever strange reason, the mice here will literally eat soap. They ate a couple bars of Irish Spring soap, the entire bars, in just a few days. Then they started eating my bars of Lava Soap. We now have three cats and still a mouse problem. One fall I set up one of the 5-gallon bucket traps and put at least one mousetrap in every vehicle. I wiped out over 35 mice and it didn’t change anything around here. Bout enough to drive a fella to drink.
They weren't so bad here till the farmers quit getting the subsidies, so the farmers sold out and became ranchers running cattle. Not they roll out large bales of hay every few days in every field, then a few days later roll out another one right on top of the ones the cows already mostly ate and filled with cow paddies.Google: Millions of Mice Are Terrorizing Australia
Watch the video, from 2 years ago, WOW