Preparing Bonding Surfaces: Cleaning
WARNING: This page is about a different car, the 2023 Porsche Panamera and 2022 Porsche Panamera. However, it is still accessible from the selected car via links, so may be relevant.
Then, clean the bonding flange areas using a lint-free cloth soaked in isopropanol or acetone until there are no more residues on the cloth.
Leave cleaned surfaces to dry off for 15 minutes; the bonding surfaces must be completely dry.