There's small brushes available that you can get in there, but if you can't find any readily, (this is gonna take some fiddlin' on your part) try rolling up some 120 grit sandpaper with the grit to the inside and get over the pins. Don't work on it any harder than necessary to knock off the heaviest of the corrosion. Blow out anything you knocked loose and look it over. You could swab a little vinegar (it doesn't get sticky like Coke) in there after that and then hit it once more with a finer grit like 220, swab it out good with a little water and let it dry. From there, I'd put a little di-electic grease for each pin on the trailer end (male connector, female pins) of the plug, hook her up and check it out. I expect you'll see some improvement.
I use mine enough (7-flat and 6-round, lightly greased from time to time) that I don't have much problem with corrosion. My problem is usually the mud daubers makin' themselves at home in the six-pin on the trailer end. Must be somethin' about a round hole that draws them, they don't seem to bother the trailers with the flat-blade connectors.
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Today's Featured Article - Chores - by Frank Young. The ceaseless passing of time! It is at once our friend and our enemy. It measures our progress and it makes us old. Like most features of our life, few things are all good or all bad, and most such judgments depend on our own perspective or viewpoint. In our particular hobby, we enjoy the nostalgic return to the days of our youth as we recreate many of the scenes that took place on the family farm that served as the stage for the first few acts of the play that is our live
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