Technically if your using DI water, you could clean the windows by scrubbing on any cleaning solution. Any thing that removes the grime. the DI water will rinse without spots.
For those of you who wash windows regular, Have you met any real lowballers?
I am doing windows when Pressure Cleaning is slow I went out today, and i try to give a fair market price. This one guy is beating me out he charges a store with 9 six by three window $2.50 for inside and out. How...