It works for a short time when used correctly.

Often I read the disappointed Rezensnionen here.
The people put the part into Hauto and calling for an immediate effect.
In the blue gel cushions, which dry in some packages to be with lies.
It's obvious when you put such a cushion in a wet car,
the this small pillow not suck the moisture of the last 5 years out of the car.
Especially in the beginning you should buy 2 pillows and 2 cushions exchange perhaps.
With me in the winter the disc from the inside is always froze.
Short track with wet shoes, 3 dogs panting and the Bavarian humid mountain air will do the rest.

I have 6 pillows.
A pillow in the tray for the driver, one in the tray for the front passenger and one in the trunk.

The other 3 pillows are at home on the heater and to replace there.
Once a week I had to first the pillow to replace the moisture once to get out.
Meanwhile I replace the pillows once a month and my disk is never froze again from the inside.
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Addendum after one year of use:
Amfamgs brought the cushions their desired effect.
After one year, the pillows bring hardly any effect.
Meanwhile, the slices freeze again from the inside to the use of the car for short-haul.
Nowe is my Lieblingstip, I received some time ago.
just open the window after use to 2-3mm.
After the water evaporates from the foot region and is the sufficient air flow of 3mm open window
also promoted. Who with the window open water should run clear,
the one can help with the wind deflectors for windows.
If you have the, the Gefuchtel with the electric lifter is not so bad.
Therefore my tip: forget the pillow and just opens the window to 2-3mm.
Deflectors cost übrigends 40euro. This investment is better than the pillows.