Use a brass "Marine tooth brush" to remove tarnish/corrosion. clean with isopropyl in a spray bottle and acid brush, then dry with compressed air or just air dry. Using any type of corrosive cleaner may deteriorate the wire over time. Treat the cleaned contacts with a corrosion inhibitor, wd-40 and dry again w/air.
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'72 GMC SWB C1500 Custom, frame-off in progress. 383 SBC, 9:1CR, Comp Cams XE262H, Scat internal balanced crank, Eagle SIR 6" rods, Keith Black dish pistons, Dart Iron Eagle 72/180 heads, Weiand Stealth intake, Stewart stage I water pump, Holley 4bbl vac sec, TH350 with B&M Shift Improver Kit. 12 bolt positraction.  
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