Correct Lubricant/Grease for Z-Axis Bearings

#1
The upper left z-axis bearing "creaks" alot when the z-axis is low and is going up. It gets worse the further the toolhead gets to the right of the machine. Bed leveling can get pretty noisy. I have leveled the x-axis a couple of times using the tool in the menu and that has not helped. Is there a recommended lubricant or grease I can use on the z-axis bearings or lead screw to help cut down on the "metal on metal" noise?