The test was carried out on a window of 1.35 m by 1.35 m. First, dry cleaning, then wet + water filling, rearranging from one side to the other. The whole procedure took 1 hour. To remove small stains and missed corners, I took a microfiber cloth and wiped the window for 2 minutes. All the same, manual labor will have to be used, because. he does not wash frames. Someone wrote that it was noisy. The noise is like that of a handheld vacuum cleaner, which is normal for me. I recommend to buy, because. good helper.