Diagnosis
This is called "crazing," a network of fine scratches and cracks in the plastic. It's caused by either abrasive cleaning or the thermal stress of very hot liquids.
How to Fix It
Unfortunately, you can't reverse the cloudiness or the fine cracks. Your main job now is to assess safety and prevent it from worsening. 1) Inspect the pitcher carefully, especially inside. If you see deep cracks or any chips, it's time to replace it. 2) For future care, only wash with non-abrasive sponges and mild dish soap. Never use scrubby pads or powdered cleansers. 3) Avoid pouring boiling liquid directly into the pitcher. Let hot soups cool for a few minutes before blending.
If That Didn't Work
If the crazing is just surface cloudiness and no deep cracks, it's likely still safe for use, just ugly. You can order a replacement pitcher directly from Cuisinart if it bothers you or if you're concerned about structural integrity.
Heads Up
Crazing weakens the plastic over time. If you use the pitcher for hot blends, be extra cautious. A severely crazed pitcher is more likely to crack or shatter under pressure, so consider proactive replacement if you use it heavily.