Never have tried it and I don't know if there is a reason not to, but wondered about using Brasso? It sure works good cleaning brass thing, but don't know, maybe it would leave some sort of bad residue? Also wondered about Bar Keeper's Friend?
A side comment, I always watch the monthly Model Railroad Academy podcast and sometimes I send questions just to see what bad answers I will get from their "expert", who claims to do commercial G installations. I asked about the brass track oxidation prevention issue and his (non) answer was to go R/.C. I have also heard him several times say brass track is obsolete and not to use it, so I asked about who currently manufactures stainless track in G and he said he didn't know and to contact some train store he frequently speaks of. I think they need to include a G expert for G questions or just admit ignorance on our part of the hobby.
Doug