When ever I do a first clean this is the method I use?
I begin at a far end top window, I scrub the frames and the windows and work my way around the property staying on the top windows only, when I’ve finished the last window at the top, I return to the first window I did at the top and wash the glass only and rinsing well.
Once all the top windows are finished I then start on the bottom windows and frames starting below the first window I did, using the same method as above, doing it this way makes sure all the drips have stopped from above, this will give you an excellent first clean every time.
On your next and subsequent cleans Just a quick wash over will give you good results again but get that rinsing down to a fine art for good results and always check your TDS before you begin.
Occasionally swish your hands through your brush with the water running to help keep your brush clean, another good idea is to soak your brushes in a bucket of pure water overnight, this will ensure you start with a clean brush every morning.