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Some of you may already know thus, but I didn't until I did this to see what happens.
This could be in the manual, but I haven't checked to see.
When you shut the car off, by pressing the "Stop" button, and everything shuts down, then pull down on the windshield wiper stalk.
The wipers will go up to the top of their arc and stop, and then stay there.
To return them back to normal resting position, start the car, wait a few seconds and then pull down on the wiper stalk, the wipers will return to their normal resting position.
The one use I can see for this is in the winter when we get snow and/or icy conditions that can stick the wiper blades to the windshield.
With other cars I usually pull the wipers up so they are away from the glass, and thus can't stick.
With many modern cars, like the S4, the wipers resting position is somewhat under the rear edge of the hood, and you can't pull the wipers up.
With this little "easter egg", the wipers come up nicely to a position where you can pull them away from the glass easily.
I use that trick all the time when I'm washing the car, and it's a lot easier than digging through the menu. Just be very, very careful to return the blades back to the window before you start the car and push or pull on the stalk. I forgot once last year and the arms scraped the front edge of the hood and slammed down on the glass. Luckily, my hood is coated with film and the film sacrificed itself and protected the paint.
Awesome tip. I have always done this through the MMI Wiper Service Position, which is annoying because it takes a few minutes to get to activate, and then get to again to deactivate once you hop back in.
Putting the wipers up is key to easy windshield de-icing if you are parking in a snowstorm. I take this car up to the mountains to go skiing about 30 days each winter, and ideally it will be snowing 4+ inches when I go so this is sometimes a daily task.