Early mk8 had issue where all water from windshield ends up into the engine bay.
My version of mk8 comes with rain deflectors rerouting water into side voids.
Each void was filled with plastic sealed sponge. (anyone have idea why)
Today I pulled out half meter long sponges, no surprise one was full of water, removed water deflectors and installed 18mm flexible pipe using bit of sikaflex and zip lock ties.