super camper is right, moving parts need grease. The down side is that grease will let all sorts of things stick to it. anything really, like fly paper (some of you remember) fly's are not the only thing that will stick.
I use a silicone spray to wash off the old grimy grease and respray with Fluid Film, a lot like the Lithium Grease.
The only thing going for you is that you can control the viscosity of the grease. The thicker it is the stickier it is, axle grease will stay a long time, silicone not so much. Fluid Film and Lithium grease some where in the middle. Just my take on a necessary maintenance plan.