Here's a video of Ac using an an Unger pole for soft washing. I like the attachment he made that allows you to soft wash a roof from the ground. But I would think that you would need two hose running through the pole. One for soft washing and the other for your DI or rinsing water. If not that I know you wouldn't want to use the same hose for window cleaning and soft washing. At least I wouldn't. The Unger has clips on the outside that allow the hose to be placed outside. Since you can also go inside the pole this would be the second hose. There is a bit of warning that I am concerned with when using a pole for soft washing and that is you will have to be carrying the whole weight of the pole. When doing water fed pole work you can lean the brush (except when rinsing) against the window and that takes some of the weight off but holding a pole straight up and down. Even worse if you have to hold it at an angle. Just have to weigh out the pro's and cons, but I still think it's a good idea even despite the small flaws.