Hot tap water works just fine. Pinkies are like a minute or two, the largest rats might be a couple of hours. Then dry them off a bit and they're good to go... delicious (I assume).
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so those few pinkies get wrapped up in a wet paper towel, so WHEN they explode, which some will, inevitably, and yes, wrap them in a wet paper towel so the popcorn later don't taste curious...