If the rollers are actually a rubber composition, avoid alcohol as it can dry out the rubber and in extreme cases cause it to crack.
Lacquer thinner or rubber rejuvenator works good as does just plain water and a little elbow grease. The synthetic composition rollers used on most newer machines are best cleaned with water.
One thing, for feed rollers on Ricoh machines, if the rollers had a slight texture when new and are now slick or shiny, replace them.
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