|You might also consider blowing air through it too. Use vacuum cleaner with blow option (if you can find or have one). If no blow vacuum cleaner then a can or two compressed air may do ok.|
Then with a vacuum cleaner suck air through the paper paths. Be careful not suck up anything (typically foam inserts if evident) that ought to stay where it is.
Sometimes the rollers etc. may allow a gentle clean, degrease/deguck with iso-propyl alcohol too - a Q-tip /and/or an artist's small paint brush.