I applied the gummi pflege to every single seal that sees movement from the door, including the seal that you're referring to. It's easy to apply it too, just press the tube against the seal and dab it on then wipe gently to spread it out.Can you expand a little more on where your noise was coming from and what you did? Where exactly did you apply the gummi pfledge? My driver's door constantly rattles and I have narrowed it down to it moving against the black plastic seal at the top part of the door (part that attaches to the car body frame, not on the door). Even at <5mph in my parking garage I can hear it move and rattle. I am wondering whether your idea of applying gummi will help me get rid of the annoying sound?
The annoying noises were quieted down significantly (I couldn't notice them at all anymore), but it seems you need to reapply it every 6 months or so as the noises has come back faintly. My seals still have a nice soft texture to them, but the fuzzy seals on the door seem to dry out quickly.