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If your going to use oxylic acid you need to be very careful about the concentration. Anotherwords you need to use a very dilute solution like a couple percent. The idea is to attack the major rust...

Oxylic Acid should be great for razors. Its really a very mild acid so it should not harm the razor but if there is any writing on the blade I don't know about that. I would certainly do a dry run...