title: How do I remove special characters from the values in a nested dictionary
body: <p>I have a dictionary like below:</p>
  <pre><code>{
  'file1.txt': {'address': [],  'ORG': []},
  'file2.txt': {'address': [],  'ORG': ['DEF Pvt. Ltd','One Solutions (Asia) Limited' ]}
  }
  </code></pre>
  <p>I need to remove the special characters from the 'ORG' key.</p>
  <p>I know for a normal dictionary we can do<code>{key.strip(): item.strip() for key, item in my_dict.items()}</code></p>
  <p>but I'm not sure how to do it for a nested one, any ideas?</p>