If the blade was clean and white when you did the final drying, it is clean, all you need do is protect it with the oil to prevent it getting surface rust again. But if the rust is still coming back you need to continue the cleaning. If it is a general light dusting of corrosion, scrubbing with steel wool is often helpful. Id know better if I saw it, but it may not be necessary to put it back into vinegar maybe just working over it with steel wool will get it back to white, just make sure you get rid of all the steel wool dust by vigorous brushing.
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