Certainly, the manufacturer promises more than it. I have placed it in my car (Polo 86C) on the boot lid and must confess that the rear window was not fogged. The other disks, however, were steamed up, the further they were from the dehumidifier the more came the wipe is used. In fairness it should however be noted that the total moisture decreased and also the windshield fogged nowhere as strong as usual. When the humidity in the vehicle are representative only to the introduced wet, as is usual this time of year.
