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Make sure that the fridge is working properly.
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Tightly close the door and avoid opening the fridge repeatedly to prevent cool air from escaping.
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Place your items in an organized manner and leave space for air circulation. Keep the freezer full you can fill the extra spaces in the refrigerators with jugs of water.
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Switch off the refrigerators if you leave the house for one week or more and clean them and let the door open.