Thats what i was asking you...If you have been asked to dust and vac then i would be very wary of doing anything else. You personally may think the stairs would look shiney, and indeed I and many other people may agree, but it is not for you or me to say. For all we know the client may like the dull look. I would only ever suggest to a client that they have a floor treatment if, and only if, the floors were giving me a problem. You could end up making work for yourself in the long run, unless of course the floors are giving you grief as they are? Certainly i wouldnt treat them without permission from the client.