I dont know where I am going wrong, as I havent experience any spotting on my custy windows as this heat has dried the windows quicker,
but no spotting absolutely clear windows even on the new customers who only had first cleans done are spotless nice and clear.
And i just use the pole and brush, up and down and cross ways and clean the frames first and sometimes move the brush away from the window and rinse once or just leave brush at top of window and let the flow drop down across once.