Hardwood Flooring

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What is the safest easiest way to remove the thick white layer of adhesive/glue that was left on hardwood floors after I peeled of the linoleum? I already tried sanding and that did get most of it, but have concerns of doing too much sanding. Currently I am thinking vinegar, just not sure what safest and easiest product that will help eat away that layer of adhesive/glue.