I had a new S&W a long time ago that I left in the holster one night after duty. The night had been damp and I never gave it a thought about the gun in the holster. It did the same thing you are speaking about! Unfortunately the light rust had generated little bright bare steel colored spots. Since it had damage the bluing by what looked like it ate through the finish. I attempted to clean it but the spots were still there. Ended up sending the new gun back to S&W and they reblued the entire gun. When I got it back it was fantastic looked like black shiny candy! It was the most fantastic Bluing I had ever seen! But as those here have expressed Kroil is a fantastic product!
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