The wife uses chewing gum on them. Pops a little piece down the holes she sees. You won't see any results until the following spring. Seems like the buggers stash it all and then eat it during the winter. I would suspect that's the case with most baits used on these critters. Like everyone else, we put up with them, there fun to watch, but you have to go after them every once in awhile otherwise they will get totally out of control.