WARNING: This page is about a different car, the 2010 Porsche Cayenne, 2009 Porsche Cayenne, and 2008 Porsche Cayenne. However, it is still accessible from the selected car via links, so may be relevant.
Removing seal
1.1. Remove the seal -1-
from the circumference of the sheetmetal flange -arrows-
.
Fig 1: Removing Rear Window Seal
Courtesy of PORSCHE CARS NORTH AMERICA, INC.
Cleaning sheetmetal flange
2.1. Completely remove sealant from sheet metal flange.