My floors are old and had been sanded as much as tolerable.   I was extremely  unhappy with them and didn't know what to do.  I first was using Bona Floor Cleaner and really liked it.  Then I saw the Bona Floor Polish and decided to try it.  I think the trick is to first get the floors really really clean.  Cleaned them with a good cleaner first then the Bona cleaner.  Let dry thoroughly.  Then apply the Bona Floor Polish.  As you can see from pictures a total transformation!!  I'm happy now!