For me so far the best result in the application. I take the glass cleaner along with the built-in washer and then the Leiheut Kärcher window vacuum cleaner that goes cleanly and quickly. Margins of course you wipe with microfibre cloth, but then the window is nice and clean way, obtained with cold water for best results. 2.5 liters of water rich all, then this hät concentrate forever.
