Ok. I bought a wagtail flipper a few years ago & dumped it into the shed as could not get on with it. Have now decided as more experienced now to have another go at doing high windows without ladder. I have watched the vids on YouTube. I can clean the windows & can squeegee them no problem. One thing that bugs me all the time & one reason why I stopped it is WHY do I get lines down the middle. On the vids they do one pull down move over & do another pull. No lines. I did the girlfriends mums today & got lines & it's really bugging me why. I do everything they do on the vids.