if it works do it lol, you know your getting good when on big bottom windows/doors you use the aplicator in the left hand and the follow it with the squeegy in the right hand in one single sweep ;-) look up dog earing for channels meant to be really good, also i 100% recomend the proffesional blue glass cleaning cloths, lee at the window cleaning mag can get them for you, they are miles better than scrim and microfibre cloths in every way