rodents, and especially rats and mice, will love any dark enclosed place, more so if the pathways inside are fairly narrow (to keep predators away). Behind dash, under (or inside) seat cushions, engine compartment, AC ducts, trunk (especially spare-tire well), the list could go on.

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1990 190e 2.6 - The only one I can really call "My Car".

1987 190e 2.3 - The donor car's up and running, only mods are Euros and a Sony headunit. My Dad's runabout now.

1990 300e 2.6 - The parents' ride.