Apparently the copper wires in the plug are corroding.
Green stuff on electrical plug.
Spray with wd 40 and wipe it down.
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I was walking down the hall at work and noticed some green stains on the receptacles at work.
Therefore whenever this green substance is found at socket outlets etc.
If connected to a battery the subsequent corrosion can take the form of acid leakage.
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.
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.
Moisture has corroded the copper.
It should be removed and the terminations cleaned gloves should be worn otherwise it is possible that tracking overheating may occur.
Wd 40 will clean and replace the moisture on the wires and in the box.
Electrical wires are usually made from copper and as such prone to oxidation.
Apart from make your eyelid burn when you rub it like i did i might end up like that bloke.
Shut off power remove the outlet.
The green substance is a combination of copper oxide and plasticiser which is conductive.
The green liquid is definitely coming out of both prongs on the plug only when current is passing through it.
Thanks mate your a diamond ive just left a post on the other green goo thread how what can this stuff do to you.
The outlet spray it then blow it out and you will be good to go.
Or replace it they are not expensive.