April, I've been petrified of mice all my life. I put the peppermint oil on cotton balls over 3 months ago in addition to the traps and it appears to work because no trap has been tripped and no signs of any mice. :)
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You have to find where the mice are entering the house from the outside and close those openings. Otherwise, the mice will just make runs through out the walls of the house and make nests inside the walls. An example, if the roof leaks you find a seal the leak on the outside. You don't seal the leak from the inside of the house. You might try some DeCon or mouse traps but they may return.