Once I got used to looking at the rear view camera in our car when I back up, I found it really helpful. However now that winter is upon us, it becomes pretty useless, unless I remember to wipe the lens before I back up. Above you can see what it looks like, if I forget.
The whole back end of our car gets very dirty with all of the wet slush flying up, and since that is where the camera is, it to gets covered with debris. If I had a dime for every time I forgot to wipe off the camera before I backed up, I would be a rich man today.
The photo below shows how dirty the camera (and back of the car) gets.
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