Shimano Grease. A grease that is formulated by Shimano for use on headsets, hubs, cables, and a multitude of other parts. Effectively seals out water, preventing corrosion of expensive components and saving you time in the workshop.
Properly sticky, this grease stays where it's put. It's easy to spot when it's time for a change when it's not that lovely snotty colour. The tube head is threaded and will fit most popular grease guns.