Microwave cavity has persistent bad odor even after cleaning.

Steps:

• 1. Deep clean: Wipe interior with a mixture of water and baking soda or vinegar. Heat a bowl of water with lemon slices for several minutes, then wipe again.
• 2. Waveguide cover: Inspect and replace if stained or burned.
• 3. Filters: On over-the-range models, clean grease filters and replace charcoal filters as recommended by Vida.

Persistent odors after thorough cleaning may indicate residue in inaccessible areas. Continued use will usually dissipate mild odors over time.