The alternator....

[David]

That could be it. I'm sure I'm thinking of a paste you smear on that removes ally oxidation.

Maybe you're confusing that with Naval Jelly (by Loctite) which removes rust oxidation from ferrous metal?

While Googling around, I did find this however: https://www.amazon.com/Henkel-01-802.../dp/B000BZX3PI
... which is the only ad for it I could find for it, and appears to be NLA anyway!

Muriatic acid, Phosphoric acid or Hydrochloric acid would also do the trick I think, but I wouldn't fancy getting any of them near my car at all, let alone in any concentration likely to be effective. Try to explain that to the insurance company when your engine spontaneously catches fire as a result of cleaning it! All in all the Race Glaze product sounds the best one to try?

David