Persistent bad odor inside refrigerator even after basic cleaning.

Safety first: Unplug the refrigerator before deep cleaning and avoid harsh chemical fumes in confined spaces.

Steps:

• 1. Empty and clean: Remove all food, shelves, and drawers. Wash with warm water and mild detergent.
• 2. Clean drain channel: Locate the drain hole at the rear of the fridge compartment (if present). Flush with warm water and a small amount of baking soda.
• 3. Air channels: Remove accessible covers over air ducts and clean inside with a soft brush and mild cleaner.
• 4. Deodorize: Wipe interior surfaces with a solution of water and baking soda or a food-safe refrigerator deodorizer. Leave doors open for several hours to air out.
• 5. Replace filters: If your Siemens model has an air filter (e.g., anti-odor filter), replace it according to the manual.

Note: Severe odor after spoiled food may require repeated cleaning or, in extreme cases, replacement of heavily contaminated plastic parts.