snake oil?

Ok so i bought a used d-5 and i cant tell if the autofeed needs rebuilt or not but its not working to great ,but i noticed the cable is pretty rusted up and old ! I was thinking about trying to clean it up before sinking money into a new cable and then auotfeed ,has anyone used anything other than snake oil or wd-40 to lube cables is there a low cost alternative that works as well?I never worried much about having a rust free cable on my manual feed electric eel cause it didnt make a difference !:vs_mad:

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