I've had problems with mice and finally tried a combo, using the killer traps and peppermint oil on cotton balls strewn around. The traps were to catch the mice that weren't put off by the peppermint... but were lured in by the peanut butter. After the first year, no more mice and I'm sold on the peppermint oil. It's pricy for a little vial, but it lasts a long time, a vial is good for a couple of years, it smells nice, no mouse poop and no dead mouse smell.
Wherever you go, there you are