Hey Tony - did you shoot it first with Oven cleaner (yellow can)? Do that first then tackle with a wire brush or "rust stripping attachment" Looks like a wheel with holes in it. It'll polish right out much easier... 1/2 the time.
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"If you can make black marks on a straight from the time you turn out of a corner until the braking point of the next turn, then you have enough horsepower"
-Mark Donohue