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I have never had cob lay on the ground long enough to go bad so the deer didn't eat it. It's always ate up. Even in rainy November
I'm new to Washington, so don't know how it would work, but a great bait we used out East was hanging a peanut butter jar with the lid off over a limb of a tree so the raccoons couldn't get to it. The deer would wear it out and since they could only get to it with their tongues, it lasted a good while. I normally had to throw out some corn to get them to try it, but once they did it was like crack cocaine.