Lubricate throttle spring and axle - with what?

I plan on cleaning the MAF and throttle body today or tomorrow. In reading up on that I have seen suggestions to lubricate the spring and the "axle" where it passes through the body, on each side of the plate. However, nobody said what to use for said lubrication. I will be using throttle body cleaner, which is supposed to leave some lubricant behind, but if that was sufficient, probably there would have been no specific mention of lubricating those points.

So, what, if anything, does one spray on the spring or axle? For the latter I'm most tempted to go with "nothing" since I fear that anything substantial, like grease, will just gunk up the area and eventually cause the plate to stick.

Thanks