Many people swear by glass cleaner for streak-free results when cleaning windows. If you don't have a special cleaning product at home, you can use other means if necessary.
Ökotest magazine recommends using 250 milliliters of white household vinegar, 250 ml of water and the juice of two squeezed lemons for a homemade glass cleaner. Another option: You clean the window panes with a mixture of vinegar, a little liquid soap and a little vodka, which should help ensure that no unsightly streaks or streaks remain on the pane.