May I suggest:
LPS3. A good rust inhibitor, leaves a slightly waxy finish but nothing that picks up dirt like grease will. At work we use it on chain hoists used indoors and outdoors, left out in the rain and chains dragged across the ground.
Aircraft Spruce sell a $20 nicopress tool that is compressed by tightening bolts.
http://www.aircraftspruce.com/catalo...?clickkey=9117
Jim