I wouldn't want anybody but photographers to know this, but I have been known to misuse some of their liquid detergent. It's a bit like my pink pajamas. The ones I wear in the summer when it's hot, in the winter when it's not, and sometimes in the springtime, and sometimes in the fall, I jump right in between the sheets with nothing on at all.
Does PE or any of you know exactly what is in Photoflo? How do we know it is in fact not the same as the stuff you put in that little dispenser in your dishwasbher to prevent water spots?
Actually, I have not used anything but a fresh paper towel or a soft cloth, like an old fashioned diaper, with which I gently remove the surface water film. I have not had any problem with scratches or water marks, or even the mineral content of my well water. If this be treason, make the most of it!