We had the same thing happen to us, I took foam and put it wherever i could find a space, particularly where the water pump is located, and also where the heat vents enter under the sink, we had Irish spring and the mice ate it, so that wasnt such a good idea, then our son bought us those ultrasonic plug in thingys that i said were garbage, but we have never had a problem since, going on 2 years now!
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