I blew up a a piece of ceramic, how do I get glaze out of the wall and off the element?

  1. Dig it out of the wall carefully.
  2. Use safety glasses and a dremel to carefully grind the glaze off the element.
  3. Vacuum the kiln very well afterwards. 
  4. It may break the element or not get all the glaze so probably count on replacing the element before too long.