The Sabitoru rust erasers are a must have in your sharpening kit. Ryky uses these all of the time to clean his whetstones, remove rust from knives. When used in progression from coarse → medium → fine, you can remove and cover up unwanted scratches from sharpening or marks left from accidental contact with other kitchen tools.
These rust erasers are also very useful for cleaning other stainless steel items and tools you have in your home.
Made in Japan