Marshmallows are dern hard to beat
I like the golf ball idea for a mice deterrent, especially since living on a golf course, produces plenty balls ending up in the back yard.I mix the cheapest generic cat food I can find with a splash of fish oil and a teaspoon of shellfish oil in a 5 gallon bag. Place a small amount in the DP trap- about up to the trigger. Place a golfball on top. That keeps the mice and most moisture out of the trap and it serves as an attractant to the coons in the dark. This method typically yields 80%+ catch rates per night all season for me. I have used plain catfood without the oils but my catch rate goes down as they don't put off as much scent. I do catch possums about 10% of the time but have only had one skunk in the last 5 years using this method.