Rinse the reel for a few minutes in very hot (60C) water - hot enough that you can't hold your hand in it. That will get rid of any residual stickiness. Run the pencil over it once dry and then (most importantly), blast it with a hairdryer immediately before use. The hairdryer gets it that little bit more dessicated and allows the film to slide freely instead of sticking.

Some people remove the silver balls from their paterson spirals to allow the film to run in more freely, it's a personal-preference thing. It's not as ratchety if you do that, but it will reduce jamming at the entrance.