I know four guys who swear by them and I think they're ok. I haven't really used them much because I have the scrim but they were ok.
I'm talking about 100% cotton, quality bath towels. I have to believe that what you used to scratch a window has to be different than the towels my window cleaning friends use.
I wonder if Steve O, @Rich7428, only uses the large bath towel on his shoulder to wipe frames? I think he throws it over the end of his pole to detail the top edge of the window but I wasn't paying attention. Anyway that's how the old school guys in Boston do it.