text: If alkali builds up due to ion exchange, and remains on the surface of the glass, the decay process will accelerate. The presence of sodium or potassium ions in the alkali build up will increase the pH on the surface of the glass, causing it to become basic. This will dissolve silica from the glass as well as releasing more alkali ions.
  The haziness seen on the glass may not disappear entirely when washed and dried. When examined closely at an angle with a low light, fine cracks like tiny silvery lines or shimmering rays, may be visible. A microscope can confirm the presence of cracks. The cracks are caused by the loss of alkali, which leaves microscopic gaps in the structure of the glass.