For negatives, Photoflo should work well enough.
I heard a good explanation of why soaps are effective.
Think of the virus as being 'mailed', transferred, to you in a protective envelope.
The envelope protects the DNA message inside, which is fragile and can no remain together without that envelope's protection.
Common soaps, simply wash away the envelope and the virus within, is destroyed without that enclosing protection.
I hope this helps.
PS: Ditch the negative carriers and use fresh, clean ones, once you have cleaned up the film.
Rewashing the prints with water, alcohol solution should work too, but I keep Everclear, 95%, for tasks like this sort and shellac mixing, as it is no poison, unless you drink it, and leaves a cleaner feeling skin surface than rubbing alcohol, in my opinion.
IMO.
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