We have an engineered wood floor that covers our 375 sq ft kitchen/foyer. I had a company come out almost 2 years ago to put a polyurethane finish on the floor. Unfortunately the finish never did adhere properly. They came back out just last month and applied a new product they felt would provide a better bond. No luck. Now we have two coats of a poly finish that does not look good. Because this is an engineered floor it cannot be sanded. I'm able to remove the finish using a putty knife but I am damaging the floor a little. I have tried to research chemical strippers but there are so many on the market I don't know how to choose. Other than the finish, the floor is in perfect condition and we really don't want to consider replacing it at this time. Any ideas for removing the poly finishes without damaging the color of the floor or the wood itself?