I did this with a set but taped off the bearings to not expose the bearings to the solution. I also used a shallow pan with just enough so the bearing was above the level of liquid. I would think if your axles are rusty inboard of the bearings it's probably a good idea to have the bearings replaced. The evaporust can be washed away with clean water so if you were comfortable submerging then you would want to thoroughly wash and lubricate them soon after.
Dz
Dz