If you have "auto" leave auto on, leave A/C or climate on and set your temperature to 20/21 or your own preference and the sensors should do the rest for you. If you need to "boost clear" use the buttons as described above by Andy, but when you turn them off once the screens are clear, make sure the buttons are as first described here and that will then control the problem, unless as suggested, you have a damp problem within the car.
Other methods are available, but this works for me.
Other methods are available, but this works for me.
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