Looks like white lithium grease. It comes in a spray can available at most any parts store or WalMart and many other places.
This stuff works good but tends to hold dirt and dust if not maintained. When contaminated in this manner it turns to a sticky glue like substance. Soak it with WD-40 to loosen and remove as much as you can, then re-apply the lithium grease.
This stuff works good but tends to hold dirt and dust if not maintained. When contaminated in this manner it turns to a sticky glue like substance. Soak it with WD-40 to loosen and remove as much as you can, then re-apply the lithium grease.