Good evening, last winter we already had the phenomenon that water has gathered in the trunk. Not only damp, but really a few mm of standing water. The water looks clear. At first I thought that something has run out. It doesn’t seem to be. This winter the same again, where I have to say that I did not really look after it in the summer. The rear window washing system works perfectly, so that a drained hose also does not come into question. I don’t see anything at first sight. There are no traces of water on the tailgate. What could that be? Thank you for your help.