I'm pretty sure Kodak makes a film cleaner.  It's not water-based.

Most non-water based film cleaners will not swell the emulsion. I like to
use PEC-12. It's an extremely volatile cleaner, which means that your slides
are dry and ready to work with in mere seconds. And because there's no
swelling, there's less risk of physical damage.

 1940's and 1950's Kodachrome film was coated with either
of two types of lacquer. The older one was soluble in a 5%
sodium carbonate solution or in stock Dektol developer. The
other was soluble in Carbon Tetrachloride, which was Kodak's
recommeded film cleaner at the time. Kodak recommended that
the film be tested with Carbon Tet first. If the laquer came
off the cleaner could then be used to remove it all. The
alkaline bath will cause the solvent type laquer to swell
and craze, possibly damaging the underlying emulsion. In
either case the film should be washed after removing the
lacquer.
 At the time Kodak made a lacquer for replacing the
original. I have no idea of what to use now. In place of
Carbon tet I would suggest 99% Isopropyl alcohol, which is
Kodak's currently recommended film cleaner. A brief test
will show if it works on the lacquer. Carbon tetrachloride,
once a very common solvent and cleaning fluid, proved to be
very toxic and also an environmental hazard. Even if it were
easily available(which it isn't) I would strongly recommend
staying away from it.
  You may possibly be able to get more information from
Kodak. Their customer service number in the US is toll free
1 800 242 2424, ask for extension 19 (professional service).