A holder to mount a 8mm to 4mm y push fit hose adaptor to a brush intended for window cleaning. This is a work in progress and have not been tested thoroughly in the field yet. Here are my first impressions using it as a alternative to a regular WFP. One thing I did not think about when working like this; you are so much closer to the window, and thus you get wet from the water splashing back at you, especially when scrubbing. The bristles on this car brush seems a bit too soft, as they don't scrub away very much grime. Though this was a first clean so they were rather dirty. The long handle on this particular brush makes it difficult to get a lot of pressure on the head for some reason, I might build a brush with a shorter handle next time. The top nozzle could benefit from sitting higher on the brush as you have to angle the brush a bit awkwardly. I'd rather have a wider brush head for this kind of job. Inspired by this Richard Clue in this video : https://youtu.be/yxudd5sa-nw?t=179