and remove drawers/shelves for access.
Flush with a solution of 1 tsp baking soda + 1 cup hot water to remove mold/biofilm. defrost drain refrigerator
Use a turkey baster or funnel to pour hot (not boiling) water directly into the drain hole. Wait 10–20 seconds. If water drains freely – success. If it pools – continue. and remove drawers/shelves for access