A few icy days later, my wife complained (there was still filled the cheap product) that their wheel when operating the washer still iced up during spraying and the nozzles are partially obstructed. Both cars are side by side in the carport and the mixing ratios were also identical (up to - 20 degrees).
After a lengthy, annoying cleaning action on this washer I have disposed of the remaining contents and also filled the Sonax Antifreeze and from that date was calm. Sometimes greed is not just horny.
Oh, and when buying from Amazon I saved opposite the petrol station and a few more euros.