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There is so little I have to add on that.

Maybe just that little helper
316595

I don't know the English name for the thing, but it's basically a mix of white clay and soap. Does the hell of a...

Well, one sure way to remove rust on a blade is actually to use WD-40 and another carbon blade to scrap.
Try one blade you don't favor too much and time will tell, but I dont't think that could hurt...