Remove the glass tray and turntable from your microwave. Soak and wash the items in dish detergent and warm water or in your dishwasher. Rinse the tray and turntable and allow them to dry
Scrub the top, sides and bottom of the microwave, using paper towels and a household cleaner that contains bleach, to remove food splatters and crumb remnants that might be causing odors.
Put the turntable and glass tray back in the microwave. Line a plate with aluminum foil. Pour activated charcoal particles on the surface of the plate and place the plate in the microwave. Close the microwave door. Leave the activated charcoal in the microwave for 10 days or until the odor dissipates. Do not use the microwave during this time.