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What is the black stuff in my window air conditioner?

Remove any mold growth that can be seen. In your bucket, put a solution of 12 cup bleach, 1 tablespoon mild dish soap and 3 gallons of hot water. If there is mold on the air conditioner front grille, you have to clean it. Allow the solution to sit on the surfaces for 10 minutes and then rinse with water and a damp cloth.

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