copper contacts how do you clean them?

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If I want them to look all pretty then I'll use some Brasso with a microfiber cloth. But one of the tools I always keep in my vape kit is a fiberglass pen. You can pick one up from RadioShack or any store that sells electrical equipment. They're about $6 and come in really handy for clean small bits of metal, especially contacts.
 
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CanIPlayWithMadness

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Guys, I'm also having trouble with the copper on my pass-thru for my ProVari. The citric acid and/or eraser sounds good.

BUT, my pass-thru is only a few months old and it's already showing signs of brown stain which is not allowing it to make good solid contacts. So, is there anything that I can use to keep the stain away after I clean it? To protect it so that it's not likely to stain so quickly?

Thanks.
 
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