As mentioned previously, if the material is glass beaded, all you can do is carefully dust the surface. Any attempt to clean it will take the beads off the surface.
It the material is a matt white, you can use a mild solution of water and soap. A mild dishwashing liquid such as Ivory is best - nothing with abrasives or wax.
I would suggest you test a small corner first.
------------------
Bob Hadsell
Home Theatre Sales Manager
DRAPER, Inc.