In one hand the karcher vacuum and in the other hand the bottle with the windscreen (mixing hot water + a few drops of dish soap). Before I had as a pro, raclette and windshield but inside the house always full of drops, ultimately, to the ground. I also have a steam cleaner with squeegee; but glass with very unwieldy steam tube and the heating time is too long and also drops to the interior of the house. While with the karcher always ready and no thread !! (I bow window 1 and 4 large windows windows + 5 + 3 roof windows).