Any good moly will do it, though moly content can vary from one to another.
Degrease everything and then put a pea sized amount in the palm of one hand, grip and drag the spring through trying to drag as much as possible off as you go. Lube the rest sparingly and rebuild.
There are all sorts potions, lotions and exotic sounding things out there, but I think it was Jim Tyler who said "It doesn't pay to be a lubrication pioneer!"