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I wouldn't use WD-40 unless you have a way of getting it off. Besidea being FLAMMABLE (around hot tubes and power resistors, no less) give it some charge, and it attracts dust and particles right out of the air onto yore sockets/board/switch wafers. Lastly, over time it turns to GUM. I once thought it was the cure-all for old car clocks, boy was I wrong!
I recommend Rid-Ox or De-Oxit. If you can find a can of Blue Shower, grab it, it has no silicone to leave behind and attrct dust. Be careful with automotive-brand contact cleaners, they can destroy many plastics and are very bad to breathe the vapors of.
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