Built our house 7 years ago and had VCT tile laid. It was never finished. (Literally laid to the floor and the left). We decided to finally finish one of the floors due to some other renovation projects. We rented an orbital buffer (?) and buffed the floor with cleaner using both a coarse and fine grit pad (black abs white). We have mopped the floor with clean water. The floor has dried at there is still yellow staining between all the tiles. Is this normal? Should I try to remove the yellowing prior to applying the finisher? If so, how? I have added pictures showing the floor before we cleaned and after the buffing process (both faraway and up close).