A little practice and you will be fine. Make certain both sides of the window are sprayed so that it glides and finish in a corner that you can reach so that you can wipe dry that corner. And be sure to hang onto the string!
the magnet is super strong. sometimes the glossy fabric could be larger to cover more. but passing it two or three times we get a very good result
I live in a high rise and construction in the area has made a mess of my windows. They look like mud. With a bit of patience this item was great. Take your time, start by going around the outside edge and then work your way in overlapping by half each stroke. its well worth it.
I live in a first floor apartment with large double glazed windows thats impossible to clean from the outside. I cant recommend this product enough. Its easy to use and works fantastic. The magnets are super powerful and I used fairy liquid in a snake motion on VERY dirty windows and then took pads off to use the rubber scraper to polish. Result is A*