I have an old 1996 golf that has a leak somewhere and only when it rains. But this is the strange thing:

When the car is leaning back, no damp appears in the car. When the car is leaning forward water appears in the foot well of both driver and passenger. Its not coming from the roof as the ceiling inside is dry and the seats are damp free. The outside plastic thing at the bottom of the windscreen is broken (sorry I don't know its proper name) as well.

Which seals should I check first or could it be that plastic bit? If you need any further info please let me know.

Thanks