I have heard mice have sensitive noses and hearing, so strong scents and loud sounds are deterrents. But I also have heard that they get used to these things and eventually come back.
Having poor eyesight, they also avoid light. With the low cost of running LEDs these days, it seems to me that lighting problem areas might work. (In the winter, I remove an HVAC cover in the RV where mice used to nest, just to allow light in. So far, so good).
Food for thought?
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