It's not always obvious, and sometimes it's only just a feeling.
This restaurant was seeing mouse droppings under the bar. Any obvious "mouse holes"? No.
But what about this air duct? Are those rub marks? Are those scratches from somebody's cute little feet?
Maybe.
In this situation, there is no hole to close, because the air duct is needed. So we had to just go for population reduction using bait stations, snap traps, glue traps, repeat catch traps, and a little repellant.
There is a lot more that can come through the air ducts than just air.
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