The Art Velours seats are covered in a material similar to Alcantara but they can't call it that because the name is trademarked.
I clean mine just like I would if it was genuine Alcantara, use a hoover with crevice tool to get rid of the dust and lift the fibres, then lightly rub a damp MF over it. For any stains use a mild cleaner like Autoglym Interior Shampoo.