Checking Front Door Window

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Fig 1: Identifying Position Of Door Windows

Courtesy of PORSCHE CARS NORTH AMERICA, INC.

Information

The hydrophobic coating is extremely durable. If the hydrophobic characteristics are reduced, a new coating can be applied to the windows without any special measures.
Check whether new coating needs to be applied by examining drops of water on the windows.

Spray on water using a water spray bottle with an atomizer and check the hydrophobic layer from the droplet formation.

Droplet formation - hydrophobic door window OK

Fig 2: Identifying Droplet Formation - Hydrophobic Door Window Ok
Courtesy of PORSCHE CARS NORTH AMERICA, INC.
Droplet formation - coating worn.

Fig 3: Identifying Droplet Formation - Hydrophobic Door Window Coating Worn
Courtesy of PORSCHE CARS NORTH AMERICA, INC.