As Carl added, keeping the blade covered in tape is the key, but I usually end up with some small scratches that really show up on the polished blade.
I end up clamping the handle in a vice and getting a nice flat bar (12" rule works well) and wrapping this with wet sanding sandpaper. Start as coarse as you need to get rid of te scratch (I think I usually start with 220 or something) and then work down to 1500 or so. Always sand in the same direction and keep the paper good and wet. When you get done, the blade should have a nice polished finish once again. The only drawback is the Helle name will be gone from the blade.
Good luck!