Unplug the microwave and let it cool completely
Remove the turntable, roller ring, and any loose parts
Wash removable parts with warm soapy water
Wipe the interior with a mixture of equal parts water and white vinegar
Heat a bowl of water with lemon slices for 3 to 5 minutes
Leave the microwave door closed for a few minutes to let the steam work
Wipe down the interior again with a clean damp cloth
Clean the ceiling, vents, door seal, and around the turntable area
Sprinkle baking soda inside and leave it overnight if the smell remains
Place an open bowl of baking soda or activated charcoal inside when not in use
Run the microwave empty only if the manufacturer allows it
Replace any burnt or damaged food splatters, filters, or parts if needed
Keep the door open for a while after cleaning to air it out