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We've tried using a whole bunch of wood cleaning products for this and similar marks on our floor, but nothing seems to work. What exactly am I dealing with here and how can I fix it?

enter image description here

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can you feel it on the surface? – Steven Feb 17 '13 at 23:18
I cannot feel it. I can't even see it if I don't look at it from a certain angle. – Flotsam N. Jetsam Feb 18 '13 at 0:36

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