Mice HATE 'Bounce' dryer sheets.
You can put some of these sheets on top of the engine block & on the dash inside the car overnight and this should scare them away. Be sure to remove them before you drive away.
You will also need to set some mouse traps to catch them or they will return.
〉 Answered on Dec 17th, 2014 by Amy Mattinat, Owner and Author at Auto Craftsmen Ltd
White or cayenne pepper repels rodents from engine compartments. It's actually a very common issue & make sure you take care of it ASAP because little critters get cozy, start chewing things & build nests!
〉 Answered on Dec 17th, 2014 by Gelina Aquilina, Service Advisor / Mechanic at
Hi John, This is an issue we're seen numerous times. Some vehicle parts are attractive to mice because of their scents. Other times they are just looking for a warm, dark place to hide. If a vehicle is parked for long periods of time (not used every day) rodents are a common issue. Classic car owners have come up with creative ideas. Some suggestions are dryer sheets, mouse traps, mothballs and garden sulfur. Good luck.
〉 Answered on Dec 17th, 2014 by Maryann Croce, Owner at Croce’s Transmission Specialists