<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def clean_cache(self, request):
 """ Remove all MenuItems from Cache. """

        treenav.delete_cache()
        self.message_user(request, _('Cache menuitem cache cleaned successfully.'))
        info = self.model._meta.app_label, self.model._meta.model_name
        changelist_url = reverse('admin:%s_%s_changelist' % info, current_app=self.admin_site.name)
        return redirect(changelist_url)