butter and even tried melting chocolate and putting it on the traps. The damn things figured out how to get it off with out setting off the traps. We found that after making sure everything was sealed good with steel woo and or expandable foam, Decon was the only way we could keep them under control. This past winter was the 1st time we had NO mice at all, but that is due to the fact that we now have 9 outdoor farm cats. I would suggest using Decon. People always worry about pets getting into it, so place it where they cannot reach it. We had one of our dogs get into it. We took her to the vet and he told us that it will NOT kill your pets. If they ingest too much and get sick, they will vomit it out. Rodents cannot vomit, so that is why it stays in their system and kills them. Good luck, in my opinion, there is very little that is worse than having mice!!