The most common wall covering is washable wallpaper, which is treated with vinyl for easier cleaning. But many other coverings exist, including delicate papers; fabrics such as cotton, linen, silk, rayon, hessian and velvet; and coverings made from grass, reeds, hemp, cork or leather. They generally are not washable, although some gentle cleaning methods are unlikely to harm them.
![Tips for cleaning wallpaper](http://www.unpeintrepro.ca/images/timely-tips-for-cleaning-wallpaper-600x360.jpg)