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.