Maybe you could check it out using an angled light. Reflect light on the film and see if you can see scratches. If the scratches are on the matte side, check the camera side. If they are on the shiny side, check the back.
Also, since the image is upside down in the camera, the sky is at the bottom of the film gate.
You can always align the negative with the camera to get a rough idea of where the problem lies.
Also, Kodak isn't what it used to be. I've had some tmax with impossible to remove AH layers. The results were negatives with blotchy blue spots that didn't come off after a four minute pre wash with multiple water changes and a 30 minute final rinse in my film washer!