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Well, guys, everybody pretty much guessed along the same lines but nobody actually came up with the correct answer. My customer and some of his shooting buddies went in together and bought a bluing tank and some Dicro-Clean 909. While Dicro-Clean under normal circumstances shouldn't harm anything it is slightly alkali. If (as in this case) the anodizing is weak in areas from wear the alkali will get under the finish and remove it. What really shook him up was that they had cleaned several guns with anodized parts and this was the only one that turned. It was also the oldes and had seen the most use. I didn't expect anyone really to come up with Dicro-Clean in particular. The alkali was the key. George
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