My dealer suggested 000 steel wool pads with WD40.
I had already ordered some Autosol, and it worked well. Upon application, it creates very dark marks on the metal, but that's only the polish that blackens upon contact with the metal. And once you put a clean cloth, you get a back shiny pegs! I then put some ACF 50 on them to slow down the tarnishing...
Thanks for all the advices!