// The machine is basically a hand held wet vac and sucks the window dry after the application of a cleaning solution applied through the spray bottle it comes with. For the best results you need to get the window as wet as possible with the detergent mixture and then use the microfibre cloth on the end of the spray bottle to scrub the dirt lose before using the Kärcher window cleaner to suck the residue away.//
https://ppcwindowcleaners.uk/advice/karcher-window-cleaner-work/
It dries the window, it does not pressure wash it,