This is an evergreen question with answers aplenty. Here's mine: I just cleaned some Gottlieb score reels from the early 70s (for a Dimension) and decided to use a magic eraser with no wetting agent at all. No water, no degreaser, nothing. The results were good.
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This was a new approach for me because I was tired of the smudging that occurs on a Gottlieb score reel with any kind of cleaning liquid or paste. No matter how delicately I cleaned, some amount of ink would get carried away and spread to the rest of the score reel in a diffuse cloud. Afterwards I would manicure these smudges off with a q-tip, but it was a tedious chore.