Green "Crud" on my Slings?

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Not sure if this is the correct forum for this but I gotta start somewhere. I'm sure I'm not the first person to mention this topic, probably already discussed somewhere else, if so, please direct me accordingly.

i have numerous vintage military rifles, many with their original leather & brass slings. I don't store the rifles with the slings attached, mainly for one reason; the green "crud" that mysteriously appears wherever the brass buckles/fittings touch the leather! Heaven help you if a chunk of the "crud" breaks off & gets on your clothes, hands or carpet, it will stain anything it touches. Obviously some sort of chemical reaction between the leather and brass components. I've spent countless hours cleaning all the slings periodically only to find the "green crud" is back the next time I take them out.

Anyone know what this stuff is and more importantly, how to stop it from "growing" back?

Appreciate any & all suggestions! --728shooter

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