def clean(mapping, bind, values):
    """ Perform several types of string cleaning for titles etc.. """
    categories = {'C': ' '}
    for value in values:
        if isinstance(value, six.string_types):
            value = normality.normalize(value, lowercase=False, collapse=True,
                                        decompose=False,
                                        replace_categories=categories)
        yield value
Perform several types of string cleaning for titles etc..