On my A12, thinks like the window tracks, headlight buckets, license plate bracket, and light... I first scrubbed them down with a little Dollar Store oven cleaner and Mean Green cleaner with a kitchen sink type plastic bristle scrub brush, ... then soaked for 4-6 hours of Evoporust mixed about 60/40 with water.
Everything turned out well and didn't take off the galvanizing and black phosphate coatings.
Like Scott said, any long term soak will remove plating.
2 cents...
I also washed and neutralized with some products from this place.
http://www.schafco.com/cosmoline.asp You can order a case, and mix and match. I used the Cosmoline, which is actually more like a penetrant. Rust Veto, is more like cosmoline wax base... if I remember right.