We have oak veneer (approx 2-3mm of oak veneer on tongue and groove base) flooring in our kitchen and living room. It is now about 5 years old. In the dining room where the chairs move around a lot, the varnish has worn away and the veneer has become darker and dirty, probably soaking in a bit of liquid spills too. We are trying to sell our house and don't want to completely replace the floor (as most of it is still looking good). Is there any way to restore the worn areas to some kind of former glory? Any advice would be very welcome. I presume it all depends how deeply any staining has penetrated and whether sanding would be able to expose any clean wood. Please help.