I just dug the boxes for some P&R revolvers out of a storage space in my reloading room. I found them all covered with white mold.

Anybody have any idea on how to clean them without destroying the cardboard? I'm not talking solid mold, but not just a couple of specs either.

Wiping them down with a damp cloth should be fine. Not wet, just damp. That would be for the outside finish. If inside, that's more of a problem.

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Get off my lawn!

A little white vinegar diluted with water will kill it, barely dampen a rag with it then let 'em sit in the sun for the day