Anyone who wants to use high-strain technology for cleaning need to use purely natural hair or polyamide brushes (set or rotating). Only very low-pressure water flows out from the large opening at the brush. Thus there isn't a risk that the substantial-force h2o penetrates the insulating layer driving the facade. https://pr7bookmark.com/story18970286/helping-the-others-realize-the-advantages-of-cleaning-stone-facades