Mouse problem?

As I've stated multiple times, I have never found anything that really works. That is why there are 1000's of products out there and tons of internet claims that "This really works" with 50 people then saying it doesn't. That is why there are oils, sprays, and electronic gadgets all claiming to work, but they cannot show proof. The only thing I know that 100 percent works is to eliminate the rodent, if they are not around they cannot do damage. The other is to block off all access to the vehicle with something the rodents cannot chew or dig through and cannot climb over. The issue with the second method is that it has to be something that is easy to do or a permanent install or it won't be done every time. One of my friends owns a farm out west and several classic cars. His solution was to buy parking lifts for the classics, those are 4 post lifts, drive on, elevate the car and they are safe from pretty much any rodents because the posts are smooth steel. His garage where he parks his daily driver is "armored". 6" thick concrete slab, the walls are metal siding with a wide strip of steel that is buried around the slab and goes 2 feet up the walls, with the metal siding over that. The door is one of the old-style insulated panels, but it has a strip of steel on the outside that is floating so that when the door is closed it lays on the concrete. That keeps out the rodents and in his case snakes as well.