Yep, if you soak it in the juice your will ruin the present look of the blade. If the rust areas are small and only on the surface you should be able to deal with the problem on a spot basis. Try some WD-40 and a toothbrush to start. Also make sure that once you deal with the problem that you keep the blade oiled regularly. I tend to cycle through my collection on a monthly basis. Much easier to keep the rust away than to deal with removing it latter...and i get to look at all my blades at least once a month that way.
