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Green stuff on electrical plug.
Spray with wd 40 and wipe it down.
It should be removed and the terminations cleaned gloves should be worn otherwise it is possible that tracking overheating may occur.
This will make this hole in the wall air tight stop the hot and cold air drafts and keep the moisture away from the cold hence stopping the condensation.
Moisture has corroded the copper.
Apparently the copper wires in the plug are corroding.
Wd 40 will clean and replace the moisture on the wires and in the box.
The green substance is a combination of copper oxide and plasticiser which is conductive.
Or replace it they are not expensive.
Apart from make your eyelid burn when you rub it like i did i might end up like that bloke.
If connected to a battery the subsequent corrosion can take the form of acid leakage.
Therefore whenever this green substance is found at socket outlets etc.
This is a 24 year old 10 color set that has been sitting in a closet for years.
Anytime copper corrodes it gives off a green film.
Aug 3 2010 1.
Electrical wires are usually made from copper and as such prone to oxidation.
Replace the outlets with air tight electrical boxes or at least put gaskets under the face plates and anti draft plugs into the unused outlets.
I was walking down the hall at work and noticed some green stains on the receptacles at work.
The electrical wires will appear to have a white or greenish powder coating on them and they will lose their conductive properties.
Shut off power remove the outlet.