If the film is coated on the surface, that's hydrophilic film, used to strengthen the refrigerating effect. If it's removed when it should not be removed, then it will affect the refrigerating effect of the air conditioning. If there's a liite part of the film is washed off, it doesn't matter. But the fin is put closely to each other. You should remove the film one by one. Is the fin put closely to each other?
