I use
these mousetraps, but don't just put peanut butter on it, they can lick it clean without setting it off. I always tuck a raisin under the curl, then squeeze it so it holds the raisin tight. Then cover the raisin in peanut butter or cheese whiz. You can adjust the sensitivity of the trap by bending the "latch" as well.
They'll clean off the peanut butter, but when they try to grab the raisin it will get them.
