I had to have my hardwood floors replaced in my new condo. The building provided the new flooring and installation. I was told to leave for a few days while they installed the floor. I just returned and although the new floors feel more solid and the stain is the right color I'm noticing what looks like dust under the stain. I've even found 2 hairs under the stain. Do the floors have to be re-sanded and stained to remove all of the dirt under the stain? Could it be that they didn't bother to sand at all before staining? The flooring they used was a white oak.