Water through the rear window?

A wonderful good evening… Before I get into trouble – I used the SuFu but didn’t get much smarter. I hope you can help me (again) . My little Smurf (as baptized by my wife ) doesn’t seem to be quite dense The last two days it has rained a bit harder here in Celle . When I wanted to open the trunk today I discovered water on the luggage compartment cover . When I opened the flap, maybe 2-3 more drops have fallen down . You seem to come out of the plastic of the windscreen wiper , one by chance , if that is what is known ? I bought the “jung@smart” guarantee . Does this grip in such a case ? It is a 451 Smart BJ at the end of 2008.