With my Prius 4 I've had mice in my car for some time now.Could I find out where these mice can get in?
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This is based on my gen 3 experience, but I think similar: I think their most popular entry is the cabin air intake. You'll need to take off the wipers and metal cowl to get to this. Mesh it with 1/4" (wire spacing) galv steel mesh readilly available for any hardware store, secure with sheet metal screws (drill pilot holes). Secondary option for them is the cabin air exits, at the rear corners of hatch, below the floor. With ours I looked at meshing from the inside, but couldn't see an eloquent way to do it, so opted to remove the rear "bumper", created mesh box around each vent. In this case I was able to run the sheet metal screws iinto the plastic surround of the vents.