If I need to prepare a blade from the beginning, I usually brush it thoroughly with mineral turpentine to remove old oil and dirt, then I spray, or rather drench, with WD40, I allow that to stand overnight and dry off, then I apply the scented oil, wrap in plastic, and its done.
Singer sewing machine oil is a good oil to use too, maybe better than the medicinal paraffin that I use, and its easily obtainable in Indonesia, and cheap.
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