Snakes work well.
Soak a rag with ammonia and place in their holes. They’ll leave and never come back.
We keep a few cats outside to keep the mice population down. They have to be outside cats only, for some reason if you bring them inside, they seem to get comfortable and stop going after mice! Lol! But if adding an animal isn't an option, there is the age old trick of using mouse traps if there is a way to easily get under the house. There is also the option of rat poison if you don't have any other animals or small children around that could ingest it! Hope that helps!
Donine....Mix Decon with peanut butter and roll into balls. Throw the balls under the house .... make sure no dogs or cats can get under. Good luck!
Mix 1 part flour, granulated sugar and baking soda. Place in shallow dish where mice are most likely to find it. You can sprinkle a little cinnamon sugar, chocolate powder or finely chopped nuts to make it more enticing – just add a bit more baking soda to compensate. What happens is when this hits their stomachs the baking soda forms a gas which rupture their stomachs = dead mice