Strong musty or sour odor inside refrigerator even after cleaning.

Safety first: Unplug the refrigerator before deep cleaning internal components.

Steps:

• Remove all food and shelves; clean interior surfaces with a baking soda solution.
• Flush the defrost drain with warm water and a mild disinfectant.
• Clean the drain pan under the unit (access from rear) and allow it to dry.
• Wipe door gaskets thoroughly and inspect for trapped debris.

Corrective action: If odors persist, consider replacing heavily contaminated gaskets and ensuring good airflow by not overpacking shelves.