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What about baby oil? I'm looking at a bottle now and the 2 ingredients are mineral oil and fragrance. You can get a big bottle for under $5, and you don't have to worry about rinsing it off before...

Try some Dovo Sterol, from Classic Shaving. Its a light oil that doesn't gum up, and disinfects too. I use it, and haven't had any problems on celluloid scales.