Every fall mice invade the pantry and undersink area. We have an old porous foundation and that's how they get in. This year my husband is sealing it up so the invasion has come late, but there must still be an opening or two they can get through.
In the past I've put out mouse bait and poison cakes. The mice just seem to make a mess of them and pass on the word that there's tasty treats to be had inside this house.
Last year instead of spending money on bait I got a couple of old-fashioned traps. I had some peanut butter that was starting to go stale so a dab of that became bait. The first evening we're sitting in our living room and we hear a SNAP!. Sure enough, there's a mouse in the trap under the sink. A day later we had one in the pantry. Once the trap was sprung, peanut butter gone, and so was the mouse -- one up for them.
Last year's score: Me: 4 Mice: 1.
After the fourth mouse, we never saw trace of another.
Two days ago I saw mouse sign under the kitchen sink. Last night I set out the traps. The old peanut butter is even staler. This morning I had a mouse. The trap is baited again.
It's a great way to use up old peanut butter.