Water inside rear screen after washing?

[Laurence Brown]

I was wondering if anyone else had seen this, after washing, hosing the rear screen?
Took me a bit by surprise.
If there is an opening around the screen (maybe bottom) then it also means noise and damp can enter surely?

 

[Hotlush]

Assuming you've ruled out the tailgate not being shut properly it's probably the seals aren't quite sealing.
Giving them a squeeze can often "puff" them out enough to seal properly, otherwise get the dealer to look at them and replace if necessary.