WE live in the country so there is no shortage of mice here. At one point, we had an awful gagging smell in the XC70 which turned out to be a large & nasty mouse nest in the spare tire area. I scubbed it out with a mixture of bleach & water & sprayed it & other areas of the car with a mixture of peppermint oil & water. It seems to work well, certainly smells better. I had read somewhere that mice don`t like the smell of peppermint. We also set traps in the car as it`s always an ongoing battle. It seems that the mice like Volvo`s since I`ve never had a problem with mice setting up house in my truck.