I am unfamiliar with any abrasive scratch remover for film but Kodak
did make an abrasive reducer for retouching. This is a very old
technique, the old formulas for it recommend stove polish, an abrasive
compound for wood and coal stoves. That willgive you some idea of how
long ago these were published. I suspect fine jeweller's rouge will
work.
 The liquid scratch treatments do not remove the scratch. Rather they
have an index of refraction similar to the film support and fill in
the scratches temporarily. They will not work on the emulsion side.

--
Richard Knoppow
Los Angeles, CA, USA
dickburk@ix.netcom.com

Probably one of the last great sources for retouching supplies is Veronica
Cass, she teaches negative and print retouching and has a line of materials,
videos, and workshops.  She even sells the old Adams Retouching Machine (you
old timers know what I mean).

http://www.veronicacass.com/