How do I strip whitespaces (trim) from the end of a charField in Django?

Here is my Model, as you can see I've tried putting in clean methods but these never get run.

I've also tried doing name.strip(), models.charField().strip() but these do not work either.

Is there a way to force the charField to trim automatically for me?

Thanks.

class Employee(models.Model):
    """(Workers, Staff, etc)"""
    name                = models.CharField(blank=True, null=True, max_length=100)

    # This never gets run
    def clean_variable(self):
        data = self.cleaned_data['variable'].strip()
        return data

    def __unicode__(self):
        return self.name

    class Meta:
        verbose_name_plural = 'Employees'

    # This never gets run either
    class EmployeesForm(forms.ModelForm):
        class Meta:
            model = Employee

        def clean_description(self):
            #if not self.cleaned_data['description'].strip():
             #   raise forms.ValidationError('Your error message here')
            self.cleaned_data['name'].strip()