It seems to me the "SONAX Xtreme Scheibenklar NanoPro" leads the nano only in name. I could not detect any lotus effect. The only positive I can say about it is that it cleans well, but can my household window cleaner also. I would have buy so can save.
To achieve a lotus effect on my side windows and exterior mirrors my (because I have no wipers there) I bought RAINX. This has at least directly after applying a lotus effect. Whether holding long I can not say yet.