This is a new, but highly effective device which may be purchased through several dealers. Naval Jelly is used for the removal of heavy rust, and will also provide an element of protection. Following the manufacturer's instruction, it is wise to use gloves, mask and safety glasses. Be sure any residue is carefully washed and rinsed away. For the removal of especially heavy rust, sandpaper or wire brushes should be used.
Steel wool is effective, but hard on the hands.
Power wire brushes are great for both cleaning and polishing. I cannot stress too strongly that safety glasses and masks should be worn when using caustic materials or power tools. Study your tools carefully before doing any sharpening. There are bypass blades, anvil, beveled, and blades that meet, but are beveled inside and out. Stainless steel tools are difficult to sharpen, because they are so hard.