Hi Hazel, the Duhrer tables don't require any special care other than a regular clean and occasional polish (regular aerosol-type polish is fine).
As with all natural wood finishes it's always advisable to avoid contact with direct sunlight as this can lead to shading problems over time. Also avoid placing items on the surface for long periods such as plant pots as this can also result in staining and, in extreme cases, delamination of the veneer finish.
The Duhrer range has been incredibly popular and the only complaints we ever receive are that the most popular pieces are often sold out.