Best way to clean my pastels?  Goya Enriched Fine Yellow Cornmeal or Harina de Maiz, Amarillo Fina Enriquecida en Espanyol.   Always give my pastels a cornmeal bath after a painting.  Then I am set up to work on my next painting.  I really wanted to substitute masterpiece for painting but not everything I do is a masterpiece.

Happy Painting!