The best urethane adhesive remover I have found that won't harm the finish is Bostick's Adhesive remover. Get the liquid form, not the towels. And use elbow grease. Another option that I have not tried is "Goof-Off". This is a all purpose remover and MAY damage the finish so try it in an out of the way spot. And IMO, I would not accept a refinish of a brand new floor, especially an engineered one. Those types of floors sometimes only have one sanding available. If you use it now, you won't have it for the future. Plus you'll lose your alum. oxide finish, as you already mentioned. If they cannot remove the adhesive to your satisfaction, I'm afraid the only remedy that would be acceptable to me is complete removal and replacement. If they can get most of the adhesive off and all that is left are smudges, you may get by with a re-coat of a quality floor finish like BONA Traffic. This would be superior to a complete resand.
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