Unfortunatly there are no products that you can use inside an A/C vent. The only option would be to place some CatchMaster Super Mouse Glue Boards (Unscented) around the edge of the vents.
CatchMaster Super Mouse Glue Boards 72MB (Unscented) is pre-baited with non-poisonous glue that captures mice, roaches, and insects on contact. Catchmaster glue boards have no insecticides or rodenticides. Unscented means the product does not have a scent. Something you can smell like peanut butte…
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