How often should I clean the air filter?

You should check and clean the air filter at least once every 2 weeks or as necessary to maintain optimal performance of the air conditioner. Clean the filter with warm, soapy water below 40°C (104°F), rinse it off, gently shake off excess water, and let it dry before replacing it.

From the official LG LWG07-Series Window Air Conditioner manual, page 12

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