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and don't use it on hot surfaces
but it changes the physical behaviour of the surface completely: the contact area between a water droplet and the mirror shrinks so far that drops sit almost spherically on top and roll off at the slightest nudge — a gust of air on the move or a vibration is enough
On tyre sidewalls a bit more
On paint after parking next to railway lines
With pigmented aniline leather (often in BMW Individual
koch chemie finish spray exterior fse quick detailer kalk ex Vorreiniger and don't use it onDissolving limescale chemically with the Koch Chemie FSE What is the Koch Chemie FSE? A quick detailer with an acidic Kalk EX formula (pH 2. 5) that dissolves limescale, water spots and mineral residue on paint, glass and plastic in a single step while sealing at the same time with a polymer wax. Not suitable for vehicles with an active ceramic coating or fresh wax protection. Koch Chemie FSE (Finish Spray Exterior) is a quick detailer from Koch