Dashboard Dehumidifier 5 "Excellent" Mrs Taylor 05 February 2019 Unfortunately for me my last 2 cars have this frustrating 'condensation and steaming up' inside the car windows. I've tried everything to no avail. I read the reviews and bought this and so far its been pretty good. I've had hardly any condensation and what is there, goes within a couple of minutes with the heater on. The only one negative is during the ice/snow last week, my windscreen froze inside and this didn't prevent it happening, however I guess that is extreme weather/circumstances. The re-hydration of the bag via the microwave so far works a treat and so I'd thoroughly recommend.