Quoted from nsduprr:Those are trash. Replace them with new ones. Yes vinegar will get the oxidation off and make them look *nice*, but say good bye to any remaining zinc; your then left with raw steel.
However, if you need to clean sockets that are not too bad (or the game is not worth the investment in new sockets) start with a *Light Socket Cleaning Stick* from PBR.
By itself the stick is not much to write home mom about. But combine it with a *drafting electric eraser* and you can do a respectable job of cleaning the working inside parts of the socket damn fast. I'd say about 10 seconds per socket, in situ.
I'm not a fan of *Dremel and a wire brush tip*...the wire brushes don't last long especially on full blast, and they tend to fling the broken wires all over $%@#'s creation. Yes, eye protection has to be worn, but damn, if you forget and catch one in the eye.
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One of my customers gave me a box of stuff 10 years ago to throw out whatever I couldn’t use, inside the box was one of these drafting erasers. I looked it up and discovered that these things go for about $150 on eBay. I discovered on my own that this is the perfect tool for cleaning light sockets with a PBR stick. Thought I was the only one.