[Joachim]

Don't you guys have concerns damaging the antenna lines on the rear window when you use isopropanol?

For the rear and front window I am using this tool below

after:

1. Piece of an old terrycloth towel, stolen from mom or wife, moisturized with i-Propanol (except of the rear window);
2. Another such piece half-soaked with a water/one shot kitchen cleaner/one drop dishwasher mixture (not over-dosed!);
3. A third piece, dry and applicated at once after task 2. is done.
3a. If practicable, use instead of 3. a small, soft(!) rubber wiper without any pressure and hold with the other hand a cloth below the wiper to collect the superfluous (word game) liquid.

A friendly professional window cleaner guy gave me this advice. He mostly refuses to use commerial glass cleaners.