why does my rear wiper arm go below the rear window and don't go back correctly?

need to be re-adjusted by loosening the screw & make sure you the trick or let someone know what they're doing

Usually the nut that holds down the arm gets loose and the wiper can then move where it wants. There is a plastic cover at the base of the wiper that covers the nut. If you have any problems or further questions please do not hesitate to come by our shop and we will be more than happy to reinstall it correctly at no charge to you. I hope this helps.