In my experience, it might be better to remove all of the finish and take it down to the white, then refinish it.
What I use for removing most finishes from metal is TSP, about $3 at Canadian Tire. You just need a container big enough for the part/s in question, toss in between a teaspoon and a quarter cup of TSP (depending on the size of the parts), cover the item with hot tap water, swish it around to disolve the TSP, and have a b33r while the mix does 90% of the work for you. May take five minutes, may take a couple hours, but most finishes are gone.
Clean off the part under your warm tap with a dish brush and dish detergent.
Location: YYZ VOR 062 radial, 17.5 DME FL5280
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