the more i clean the better at it i get, you get to know which window keep dripping,
like the ones that have 2 panes at the top & a lg pane below i find that if i dont wash above the top frame or in between the two top panes i dnt get runs from the center down the bottom pane, but its took me 3 mnth to suss it out,
keep practicing ull get it rite in the end,