You can also do it on the fly. This is what I had to do... but in my script everything runs through index.php...
Code:
$body = ob_get_contents();
$body = utf8_strip_non_ascii($body);
$body = str_replace('Ã', '', $body);
$body = str_replace(' Â', '', $body);
$body = str_replace('Â', '', $body);
ob_end_clean();
print $body;