When I go into the local Northern Tool, they have this thingy that is supposed to fix old Grease Zerks. It supposed to clean them up so they'll take grease again. Anyone ever try one of these things? Its like $46 so I am hoping someone has tried one.

\'59 Chevy 1-ton
'72 c-10 (in progress)
The Great Rust(less) Mountain
\'47 Jeep cj2a