What is the patern a profesional window washer uses to squigee a window?

With so many fine glass cleaning products on the market.It is best not to use any oil products.So soap and detergents out.Methylated Spirits is good to add to water.Apply to wndow,squigee from bottom right across top and down left side,wipe blade then from top to bottom.It is wise to wipe blade every time after touching bottom.Obviously if you're left handed these strokes would be the opposite