Home Improvement Questions? Ask a Handyman for Answers
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Most of the time where there is 1 mouse there's likely to be more. How clean you keep the house is not a contributing factor. Mice naturally seek shelter indoors as the weather gets colder. It's possible the one you found is a "scout" but probably not. Putting out traps or bait (if you don't have house pets) should reveal if that one was just a one off or not