Its less about the type of window and the glass time, all glass in windows is pretty much the same well as a surface anyway, tinted and low E has more drag but the principle of cleaning the glass with your squeegee remains the same. Many if not most people will agree that to master window cleaning requires about10000hours, to be competent and proficient will take from anywhere to 6 months to a year or more depending on the individual and physical ability.
Its about the science behind what your doing once you fully understand how what and why the squeegee and the interaction with the surface it will all become clear, it just flicks on like a switch and you are like omg how did it take me so long to work that out, until then your pretty much just mimicking what you have seen. it can take a month to a year or maybe never.
