Kevin, your problem is that you have zinc or aluminum oxide on your plate. It is merely a film which must be removed without damaging the paint underneath.
I have always used some toolmakers diamond rubbing compound. It is an extremely fine paste like abrasive, like toothpaste. If you go delicately with a small amount on a soft towel, you will be pleasantly suprised to see how well it removes the tarnish. After, if you like, spray the plate with some clear matte laquer.
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3RD Echelon Wksp
1968 M274A5 Mule Baifield USMC
1966 M274A2 Mule BMY USMC
1966 M274A2 Mule BMY USMC
1958 M274 Mule Willys US Army
1970 M38A1 CDN3 70-08715 1 CSR
1943 Converto Airborne Trailer
1983 M1009 CUCV
1957 Triumph TRW 500cc
RT-524, PRC-77s,
and trucks and stuff and more stuff and and.......
OMVA, MVPA, G503, Steel Soldiers
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