Many of these suggestions have been tried in my neighborhood, since widespread rodent damage surfaced in 2019. The damage I'm aware of has been limited to Toyotas? My import mechanic has seen many makes (slideshow on his phone). He credited some cases to "invitation" => dog food sacks stored in garage; firewood stored in garage.
Our 2000 (1999) Tundra had been parked outside for 20 years, before suffering damage. We tried moth balls (paradichlorobenzene); peppermint oil spray; commercial rodent spray. Still persistent signs of rodent visits. Neighbors went thru the same trials & errors.
A neighbor w/2 Siennas, had one rodent repair @ Toyota/Honda dealer, using the Honda rat tape + wire mesh wrapped around repair. Rodents chewed thru wire mesh. Another, w/T100 wiring damage; trapped several "pack rats."
The Siennas owner found that BRILLIANTLY lighting his driveway has been successful, so far (2 years later). We used small LED floodlights under our Tundra & have had no more damage.
The Owl decoy might be useful for hunting crows, or startling birds. Perhaps could be enhanced w/recording of hoots played over outdoor speakers? My guess is the rodents are reluctant to be seen in well-lit areas, for fear of being spotted by an owl. Our next door neighbor's outdoor cat was no deterrent for our damage.
IMHO, there was a "perfect storm" for rodent reproduction in our locale in 2019. The population > usual food sources could sustain; so soy-based insulation became a temptation. Many of the usual "deterrents" might have worked under usual circumstances.
