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It is safest to use an oil-based polyurethane varnish on an old finish; the new water-based polyurethanes may not be compatible with old oil-based finishes. And, if the old finish is shellac, new ...
Perhaps you live in an historic house with perfectly intact, never-painted wood. You can just leave it be, or gently clean it with a rag dipped into water with a squirt of Ivory liquid soap. How to ...