I might not be right about vinegar. It certainly makes sense chemically. But now I’m scratching my head. I’ve recently lost two more MP40 wetsides and don’t believe I ever cleaned them with vinegar. If I did, it was only a couple times. I talked about these two newer wetsides HERE. So now I’m at a loss of to why this is happening.
Let me get this straight, you are puzzled and don't think vinegar caused your 2 MP40 wet sides to fail. You start with saying you don't believe you ever used vinegar. Then your very next sentence you say you may have cleaned with vinegar a couple times. Not sure anyone can help you on this one.