Sorry but you either leave them alone or get them sanded and refinished. Do NOT add a 'polish' to them. You will ruin them for the next person...and if that person is a flooring person and they find out about it AFTER they take possession of the home, you could be liable for the 'fix'.

Do you have photos of the floor? Are they solid with a site finish? Are they engineered? Are they able to be sanded/refinished?

Please post a photo before you do ANYTHING. It is *possible you can look at a 'buff and coat' but we can't be sure until you show us some photos.

Bona makes a decent product called Refresher but even that might be questionable to apply. You would probably have to order it since it's not usually sold in stores.

In cases like yours I suggest the homeowner pay a floor contractor to give them a proposal to refinish the floor, to be used as a bargaining tool with a prospective buyer if necessary.

A good hard paste wax containing carnauba will make your floors lovely. Works best with an electric polisher.

Please do NOT use wax over polyurethane! It contaminates the wood to the point the floors can NEVER be refinished. Wax only works on waxed floors.