The combiner is covered with coatings protecting it from scratches and fingerprints. However, we recommend that you store the accessory (cradle with the combiner) in a bag that is enclosed to the package when you’re removing the accessory from the dashboard. This will prevent the unwanted contact with things like keys, etc.
Use soft fabric to wipe the glass — for example, the enclosed fleece bag fits perfectly. When adjusting the glass angle try to hold the top and bottom edges of the glass, not its surfaces.