That sounds like the charcoal filter. It cannot be cleaned, and must be replaced. From the owner's manual:
CHARCOAL FILTER REPLACEMENT
If your oven is vented inside, the charcoal filter should
be replaced every 6 to 12 months, and more often if
necessary. The charcoal filter cannot be cleaned.
To order a new charcoal filter, contact the Service
Center.
1. Remove the two vent grille mounting screws.
(2 middle screws)
2. Tip the grille forward, then lift it out
To get a new filter, you can try local appliance parts stores or see customer service or find servicers here: http://us.lgservice.com
We're happy to help and we appreciate your thoughtful rating of our answer.William E. Miller, AS-EET
[email protected]http://www.microwavedisplay.com
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