Killing or injuring the pest can cause it to emit a horrendous odor. These creepy crawlers made their way somehow [likely through a crack] into my basement. I wanted to nip it so I tried our Insect Away when I saw one; I had no idea those guys could run! It hated the essential oils blend and thankfully the MINTY blend is powerful enough to cover the stink scent the bugs emit. So I sprayed around where they had been sighted and I have yet to see another. Will keep you posted!