For you homeowners out there with carpenter bee problems: We get carpenter bees in our barn really bad. Last year, we paid an exterminator about $300 to fill all the holes and treat the wood to keep them away. It worked for about a year. They started coming back this spring.
My wife’s employee said, “I know how to stop them.” She bought this rubbing oil, soaked some cotton in it, and stuffed it into some of the bigger holes the bees had made. I haven’t seen a single bee since. She said it would last until next spring. Amazing.
Cost about $20 plus about $2 in cotton balls and a couple hours of work. Plus, it doesn’t kill them and instead drives them away.