I do a big house it’s a massive glass complete length of the full width composite decking bit like a video A E Macintosh filmed.and knocked out one pad each time I have cleaned. I now use an unger handheld pad holder now as makes life easier on the stubborn marks.That's all I intend to use it for, add on's are extremely rare for me so I have no other use for it other than veluxs which I want to ensure they are as good as I can get them.