You should be cleaning your AC filter once a month How Do You Clean An Air Conditioner Filter
You can simply remove and clean using warm, soapy water. After cleaning, allow the filter to dry thoroughly before replacing it. What's the best way to clean A/C filters? : r/CleaningTips Soak the filter in a basin with warm water and a mild detergent for about 10-15 minutes. Agitate the water gently to release any embedded dirt. ...