@Rich Wiemann posted:
Great question George. Looking forward to the answers.
Me too, Rich - otherwise it's a good scrubbing in Dawn with about a 50% clean result. Interesting experiment last night, I dry scrubbed both (previously untouched) couplers with a fairly soft toothbrush and about 99% of the corrosion came off. Dunno if it was the nature of the metal or what, but it did a great job. That said, the corrosion on the truck side frames seems a lot worse, so that may be why it didn't work as well there.