Liquid Glass Pre Cleaner Causes Scratches

Hello yesterday I tried out a small piece with the Pre Cleaner. The paint was milky AFTER the polishing of the Pre Cleaner, as if tiny small scratches were in it. On the bottle it says the following: Wash the vehicle and leather – clearly apply pre-cleaner – clear let in effect until milky veil is formed – clear polishing with a fresh cloth just as it was made and have a milky/scratched stain on the hood. Can’t get that away What should I do? there is something wrong? By the way, Uni Schwarz/4months old. Thanks already Ann