I have been cleaning windows since 1958, we had no squeegees then, and the old leather and damp clean scrim still does the job for the insides with small panes. The old wagtail all in one is also a brilliant tool for insides and one I still use. I can se this tool being very handy when your glass is misting on the insides as you are doing them. I do an old Georgian house where this often happens, and it's a bloody nightmare. As jouk says this tool has it's place.