When I was selling Hope processors I got a call one day from the photo lab at Picitinniy Arsonal that the fix rack was running backwards in their film processor so the film was coming out unfixed inside the machine.
Being a bit baffled I went to the lab and they demonstrated the problem. I asked them how often they cleaned the processor racks, they said “not in the past few years”!
There was so much crud built up that it actually pushed some gears in the wrong direction so when the film hit the rack it reversed!
They spent the next few days cleaning, problem never recurred!
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