The other night, I accidentally left my freezer open a little bit, and everything thawed out. I closed it as soon as I realized it, and a few hours later, I noticed that there's a thick layer of ice built up on the top of the inside of the freezer. I don't think it was there before the incident. Anyways, how do I get rid of it? It's a very old refridgerator/freezer, and it's not self-defrosting.
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