twowindsbear wrote:
Once upon a time, back in the darkroom ages, there was a product called Kodak Film Cleaner. It was used to remove assorted 'gunk' - including greasy-grimey fingerprints - from negatives before printing. This product 'may' still be available - or another brand.
Won't your slide scanning company clean the slides - as needed - before they scan them?
Good luck
I have been using Pec-12 to clean slides and negatives for years. I once had a crisis of confidence so I asked at B&H if there was anything else available for the job. I was told not to worry, Pec-12 is used by everyone. This stuff removed a huge fingerprint that was on a slide from when it was developed by Kodak in 1969.