@Flyblown
You can't control whaf happens in the surrounding area with the mouse population, but you can make your own place less attractive to these burglars.
Mice are like fire, remember the fire triangle: fuel, oxidizer, ignition source.
Mice like warmth, access to moisture (remember the bathtub rat family), food, clutter to hide among.
Is your crawl space warm due to lack of underfloor insulation, or is the crawl space sufficiently enclosed to make it much warmer than outside but not sufficiently enclosed to prevent rodent ingress?
The fact you keep things swept to be able to spot rodent faeces may also in and of itself make your place less attractive to them.
Do a walk-through and think like them and their needs. You'll spot the problem.
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