Vinegar and water used to be a typical recommendation for cleaning wood floors with a urethane type of finish. These days, however, most manufacturers recommend cleaners that are specifically formulated for wood floor finishes; in fact, vinegar is acidic, and using too much could damage the finish. People who insist on still using vinegar should use plain vinegar-not apple cider vinegar, red wine vinegar or any other type, which could leave a sticky residue on the floor.