In several videos, I've seen them spray those dreaded electrical connectors. I'm assuming it's to help disconnect them. I've searched and can't find any specific electrical connector spray. I found some old forum that talked about using soapy water. However, those videos seem to be spraying some sort of aerosol spray.

Does anyone know of such a spray? What do you use?

Is soapy water really a good idea? Water conducts, couldn't that cause a short? Or rust?

  • I have always used silicone spray for this situation.
    – Moab
    Commented May 4, 2018 at 18:41

4 Answers 4


I really don't know what you were seeing in the videos, but I do have a very good suggestion for you as far as connectors go. Use WD-40. It does three things for you.

  • WD stands for Water Displacement: This means, if you spray it, it will keep water outside of the connector for as long as the WD-40 remains in there. If it's a sealed (or semi-sealed) connector, you'll most likely never have an issue as long as you don't take it apart.
  • WD-40 does not conduct electricity: When you put the connectors together, the metal on metal of the connector will allow the electricity just fine, but with the WD-40 in there, you won't have an issue with something cross connecting or electricity bleeding off to somewhere you don't want it to.
  • Lubrication: With the WD-40 you won't have an issue when taking the connector apart the next time. It will function as an "anti-seize" of sorts, allowing for easier disconnect. Corrosion will also be kept at bay as well.

Something about water is, pure water does not conduct electricity. However, once you start putting impurities in it, like soap, it will conduct then. Soap will also collect crud (dirt, dust, what have you), which will cause you issues in the future.

  • PS: WD-40 works great inside old school distributor caps. It prevents carbon tracking, which prevents misfires (for the reasons posted above). Commented May 4, 2018 at 17:47
  • As someone who has oiled bicycle chains, I can tell that the oil in WD-40 will collect crud like any oil will, and the water displacement properties of oil are limited. It may displace moisture, but not heavy rainwater.
    – juhist
    Commented May 4, 2018 at 17:54
  • 1
    @juhist - You really don't know what WD-40 is about then. It was designed not as a lubricant, but "Convair, an aerospace contractor, first used WD-40 to protect the outer skin of the Atlas Missile from rust and corrosion,". Lubrication is just one of the side benefits. And since it's inside of an enclosed connector, it won't collect dust. Commented May 4, 2018 at 18:06
  • I agree, WD-40 is not the lubricant of my choice for bicycle chains (I prefer thixotropic motorcycle lubricants in spray cans), but will do in a pinch. Just wanted to point out the obvious deficiencies that any oil-based product will have.
    – juhist
    Commented May 4, 2018 at 19:20
  • I wouldn't spray lots of WD-40 into rubber parts either, without knowing if the particular type of rubber is hydrocarbon-resistant. Generally, hydrocarbons and rubber aren't always compatible, but some rubber parts (e.g. engine seals) are made to be hydrocarbon-resistant.
    – juhist
    Commented May 4, 2018 at 19:28

What I think you are looking for is Di-Electric Grease.

Di-electric grease seals, lubricates, waterproofs and insulates electrical connections with a thin, non-curing silicone compound that helps maintain electrical performance by reducing voltage drops and problems caused by adverse weather conditions.

Di-electric grease also provides an exceptional lubricant for fasteners used to support temporary electrical work. 


There are several brands making them. I use it on my boat engine. Search for Contact Spray.

But never, ever, ever use WD40! That thing destroys more engines than saltwater! It is a great spray but not for everything!!! Use that only on metal which is stuck/corroded. Though, Never on moving parts because it DOES NOT have any lubricant in it. It dries things out and it attacks plastics too!

  • WD40 is best used on something you want to displace moisture from.
    – narkeleptk
    Commented May 11, 2021 at 23:22

For car batteries, there is terminal grease, which basically is a simple grease with corrosion inhibitors. Since it is an insulator, some pressure is required to make a good electrical connection between the contacts.

This pressure makes this grease less optimal for small connectors with lighter contacts. Here, oily contact sprays are better.

But be warned since there are often two kinds of contact sprays. For example, I know KONTAKT 60 and KONTAKT 61 from the german company Kontakt Chemie. The first is a cleaner for electrical connectors, which removes existing corrosion. This is done by some aggressive ingredients, which later will lead even more corrosion. (Like vinegar: can be used to remove rust, but also causes rust) The second product is used after to protect the now clean contacts from further corrosion.

But in general, there often is no need for that special products. Simple petroleum jelly is often used instead of terminal grease, and a simple oil can be used instead of contact spray. They don't contain corrosion inhibitors, but due to their greasy nature, are mostly good enough.

By the way: There is a contact spray form WD40, too, but it is more a cleaner to remove grease, oil, flux and other residues from PCBs etc.

You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .