Clearing a frozen or blocked refrigerator defrost drain hole requires melting the ice plug and flushing out trapped debris. First, unplug the refrigerator and remove any food, shelves, or drawers blocking the rear interior panel where the drain is located. Second, use a hair dryer on a warm setting or pour warm water carefully over the frozen drain hole to melt the ice block. Third, once the ice has melted and the opening is accessible, use a flexible pipe cleaner, a small bottle brush, or a turkey baster filled with a warm water and baking soda solution to push through the drain tube, clearing out any trapped slime or mold. Pour a small amount of bleach or vinegar down the tube to sanitize it. You can verify this step was successful by pouring a spoonful of water into the drain hole and watching it flow freely down into the evaporation pan underneath the fridge.
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