The Clemson article says Freeman traps are messy, and can attract critters. We only have the two hives yet and guess we can handle the mess. Our tiny apiary is caged to keep out skunks, bears, etc. Someone in our club uses them and mentioned oil over water works. Do you have any tips past that?I've got them under my hives, the work very well. got to keep the pans in tight or you'll let bees in and they drown. I also found I can put half the oil I thought I needed in them.