This stuff works pretty good.
DeoxIT, #D5S-6
http://store.caig.com/s.nl/it.A/id.1602/.f
I would call them and tell them what you have.
They might have a product that will match your application for a longer lasting lubricating effect.
The stuff I listed works great on scratchy audio control knobs that rotate.
I use it on any electrical connection.