A few days ago I picked up my Octavia Estate at my carwash and noticed stains on the alu trim which wouldn't clean off. I am well aware that alu trims are usually very sensitive and it may happen by using agressive clening products on hot surface etc. The stains were only present on the alu trim around the 3rd windows (back) on both sides of the vehicle.     I also tried polishing it but nothing seems to work - it feels like the stains are below the coating and you can n