If you don't want to use naptha the alternative is wipe the machine down with a damp cloth of denatured alcohol. You can go buy a small bottle of lighter fluid(for cigarette lighters) and use it . The machine only needs a quick wipe and you will not use it again. Don't use citrus de-greaser it leaves a residue that the shellac will not stick to. the naptha will evaporate instantly when you wipe down the machine. Other than this I know of nothing else that will remove the sewing machine oil from the surface of the machine. It is important to remove the sewing machine oil from the machine so the shellac will stick during the french polishing. You will use such a small amount of naptha I would not worry about it, you know best what is good for you. Please post pics when done we love to see other peoples work.Skip