Microwave has a persistent bad odor even when not in use

Safety first: Unplug the microwave before deep cleaning.

Step-by-step cleaning:

• 1. Remove components: Take out the glass tray and roller ring. Wash them with warm soapy water and dry thoroughly.
• 2. Clean cavity: Wipe the interior with a solution of mild detergent and water. For stubborn odors, use a mixture of water and baking soda or vinegar (do not leave strong vinegar solution on metal surfaces for long).
• 3. Check waveguide cover: Inspect the mica waveguide cover for burn marks or heavy grease. Replace if damaged.
• 4. Deodorize: Place a bowl of water with lemon slices inside and run the microwave for several minutes, then let it sit closed for a while before wiping dry.

Note: Avoid using harsh chemicals or abrasive pads that can damage the cavity coating.