Mice in the car

Hi my SLK was standing in a barn for a long time over the winter and now I have noticed that there apparently mice have been indoors or that eventuel is still living, inside suitcase room and everything else has not been chewed or infested, I noticed this by the smell and then I removed the carpets and found a nest at the rear speaker openings. How should I proceed now? Spraying, scattering or how? Never had such a problem my question about it. PS: As said a lles has remained salvation (hath luck)just somehow I have to get the fuckers out of there.