50/50 mixture of peppermint oil & cinnamon oil. You can spray it or soak cotton balls that you leave around the room. You will need to check and make sure it doesn't need a re-application. The scent keeps them away.
If that fails use Tom Cat mice poison, they eat it and go away.
I did the peppermint too and several homemade remedies, humane traps, etc. After killing 42 mice I used the poison. Do nt know where they died but finally after a 6 month fight, they are gone. I thought I was going to loose my mind.
I heard that Irish Spring soap repels them.