I was reading reviews of Deoxit on Amazon and found this: "DO NOT USE ON SEALED AUTOMOTIVE WEATHERPACK TYPE CONNECTORS. It DESTROYS the rubber seals inside of them. Was looking to clean and protect the weatherpack junctions on my truck and watercraft. It destroyed the rubber seal that keeps moisture out of them. I had to pull and discard the seal.. it swelled up to almost twice its normal length and was impossible to get connectors back together." So it is a great product to use, but maybe keep it off the rubber seals.