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It was in the Vinegar too long and it ate it up. I did that with a brass cattle tag and it almost ate it up too. I only leave parts in White Vinegar for 3 or 4 hours, then take it out. I use a small stainless wire brush & water on small parts and my pressure washer on the big stuff.
Here is a thread I posted about cleaning parts with Vinegar....
https://www.67-72chevytrucks.com/vbo...d.php?t=807107
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