From the official Alcantara® maintenance instructions (see more by following this link).

Ordinary maintenance

In order to preserve the beauty of Alcantara® it is recommended that regular cleaning is carried out. Don’t rub too vigorously, and we don’t recommend using steam machines.

Weekly cleaning

After having dusted Alcantara®, run a slightly moistened white cotton cloth over it. Avoid the use of printed absorbent cloths/papers as they can release ink onto the material.