I have been having a terrible time with water spots on my film. I use, and have used, both LFN and Photo-Flo. I use only bottled distilled water for the final rinse. Even using a squeegee the little bits of residual water around the sprocket holes tends to leave a water mark. I tried to rewash a roll that was processed a couple of weeks ago, and could not make the stain disapear enough to not print as density. Are there any chemical solutions to remove this staining, and even better, what could be causing it? Thanks.