I live in a farm so it's a constant battle for me. Best combo I've found is setting 20-30 traps so there is one every where you can think a mouse might pass and then set up several Tomcat mouse poison hotels. A lot of the time the mouse is dead so quickly they never make it back out of the box so you don't have to hunt for dead bodies so much. Use a high quality dehydrating poison as well, the mice will seek water making them easier to find plus it dries them up so they don't stink. After the mice seem to be all gone, keep the trap line and poison out so any new comers are quickly dealt with.
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