Ooops, sorry about missing this post yesterday. No, they are not stored in a humid place (at least I don't think it's humid?). They did spend some time in water though (basement flood), but when I found them, I thought I dried them out well. Funny thing is that there was one of those MTM charge bar thingies (for MEC shotshell presses) in the water too, and even though it's made out of pot-metal zinc castings like the '597 mags are, there appears to be no oxidation on it. Maybe my hands just have some type of weird sweat coming out of them that the Remington zinc just doesn't get along too well with? Anyway, thanks for the CLP suggestion, I'm probably going to try that.Barry said:If your mags get in that condition when stored I would have to question where/how you are storing them. Are they in a humid place with temp swings?