docs: def clean_chars(value):
      "Hack to remove non-ASCII data. Should convert to Unicode: code page 437?"
      value = value.replace('\xb9', ' ')
      value = value.replace('\xf8', ' ')
      value = value.replace('\xab', ' ')
      value = value.replace('\xa7', ' ')
      value = value.replace('\xa8', ' ')
      value = value.replace('\xfb', ' ')
      value = value.replace('\xfc', ' ')
      return value