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An old sock or some latex gloves secured with rubber bands would have helped. As it happened, a thick coating of river mud and grit coated the magnet after the first few drops. The most interesting things might not contain much iron, though. A key ring with keys, a cell phone, even a modern gun can be mostly plastic. Any guesses about the mystery object? It feels like a solid mass of metal, but may have been separate parts fused by corrosion.