Specially adapted to the cleaner Karcher windows, this concentrate is highly effective ... Once diluted in the spray and applied to the glass, it takes off the dirt without effort !! and actually did shine the windows !!! To give FOR GUIDANCE PURPOSES ONLY the number of windows cleaned with 1 dose 1 and 14 bay windows and there is 1/3 of the mixture into the sprayer but also depends on the number of sprays made !!!!