The method I use is squeegee with an absorbent green photo wipe strip. Wrap the strip around the top of the hanging film and hold on each side of the film, then pull it taut and squeegee down extremely slowly. The film dries quickly and I get no drying marks or scratches. Also, about 5 years ago I stopped using photo-flo as I find it unnecessary. I tried the other methods, but they didn't reliably work for me.