Mice need dark warm areas to create nests (harborage). They absolutely love to get inside air filters, engines, etc. No matter if it is your lawnmower, motorcycle, or car they will find it. The two pictures attached to this show you how amazingly fast they are at setting up shop in these areas. This is my car and it was in my driveway for JUST ONE NIGHT and I opened the hood the next morning to add washer fluid and found this damage!
As you can see they tore the felt hood + battery cover up to make a nest. This is a VERY SERIOUS & DANGEROUS issue because they can cause the vehicle to malfunction at any point. It can lead to a crash or fire at any time. It is virtually impossible to repel or rodent proof these things from rodents as there are over 100 entry points for a mouse to get into a car engine. Call EHS as we do have some creative solutions for issues like this.
Bruce Lopes Jr.