I don't remember seeing a scratch in the emulsion that could be cured by nose oil or equivalent. Scratches in 35 mm are usually caused by the pressure plate. Zeiss, I believe, had a camera in which the pressure plate was lifted during transport. Leitz film cartridges for the early Leicas had no felt lips, but a gate that was opened after the back was closed. I had one of those once upon a time. It worked on an early Canon RF I had.