The side window glass can delaminate. If this were to occur, replacement of the affected window would be necessary.Google+
Car Problem Reports
Mercedes-Benz CL600 Side Window Glass May Delaminate
Mercedes-Benz CL600 Problem
Visitor, 2005 Mercedes-Benz CL600, 75,000 mi
glass in both front side windows is delaminating along the forward edges. Not too bad now, but I don't expect it's going to get better with time. And I'm gonna bet these windows ain't cheap.