Annoying Dash Rattle - W208 CLK55



I'm wondering if someone can help me resolve an annoying dashboard rattle in my W208 CLK55. I've had this car over 3 years and this has been going on at least half of that time. The vinyl/rubber dash that makes contact with the windshield rubs and makes this annoying rattle. I know it's there because if I grab the dash and pull back away from the windshield while driving it goes away.
My thoughts are to either-
1. Tighten something (maybe some bolts in the has area???)
2. Lubricate - apply some type of lubricant to that space so that it slides easily when it rubs and the rattle goes silent. I would not know what to use as I'm concerned about chemicals damaging the dash material.
I took a quick video on my phone and posted here. The video makes it sound almost like a crackle.
Thanks for any help!
http://www.youtube.com/watch?v=tWyBTunaXNw



