You can't just take off the wiper arms and put them back in the right spot, you'll break them off when they try to get forced into the engine bay.
There is a nut on the wiper linkage where the arms connect to the motor. however I do recommend checking the spindles on the wiper linkage because mine did this exact thing when I first bought my car, and I reset the wiper arms. That worked for a few months until it did it again and when I disconnected that one bolt I noticed one of my wiper arms wasn't really going down so I found a tutorial on how to fix it so they worked like new.
Here is a link to the tutorial
http://www.audiworld.com/tech/misc44.shtml
it took me about an hour to do the whole thing and I wasn't rushing anything at all.
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