Try some silicone spray. I use Helmar Silicone Spray, 300g spray can for about $8. On the can it says:Doors, locks, hinges, silence fan belts, waterproof ignition systems, lubricate rubber mountings, dashboards, battery terminals, insulate electrical systems, speedometer cables, window channels, <b>removes dashboard squeaks.</b>
Sounds like Jesus Christ in a can!