If it's just a clean you're looking for, I can't imagine there's any dirt/grime that would withstand a couple days in solvent or carb cleaner... Should even soften up what's inside, maybe remove the zerk fitting while soaking. Pump full of new grease to remove the old junk.

-Boyo


'48 Willys CJ-2A / '55.1 Chevy 3600 / '66 Austin-Healey 3000 / '04 Volvo wagon (parenthood!?)