On my Challenger buckets I did it the hard way.(didn't know about EvapoRust at the time) I scrubbed them with soap/water and 0000 steel wool. I sprayed them with a clear after they were clean. I tried EvapoRust on my 904 dust cover and it turned out nice. A lot faster and easier then steel wool. I'm not sure how long I left it soak. I didn't have an issue with it removing the galvanizing.