my clk makes creaking sounds (like rubber rubbing on rubber) when going over bumps. Is there a trick to perhaps lubricating those so that they glide on each other or something like that. Any products to recommend? It is really noticeable with the seal between the top and the windshield frame.

Thanks!

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2008 S550
2010 GLK350
1997 E420 (retired)
2005 CLK500 (retired)