We take the time to walk the property with the owner to make sure we know about any issue they have with leaking windows or heavily soiled windows.
We only use the best filters to make sure when we rinse your windows after our soft scrub. They always come out shinning with not spots or streaks.
We alawys test the water with our total dissolved solids (TDS) meter. To see how minerals are in the water that can leave spots and streaks on your window. And yes even City water can have salt & minerals in the water that can leave water spots.