Reset form values after successful ajax submission

Hello,

I'm looking for an option to reset form values after successful submission. Actually, using javascript is rather straight forward, but was wondering if there was a way with php alone. It seems there would be...

Basically, I've just learned about this key value :

if (!empty($form_state['executed'])) {
  // I could therefore use this in my AJAX callback to reset my form
}

I thought I could use drupal_get_form, but learned otherwise.

I then found a similar issue with ctools 6.x #1025448: Add an AJAX form example to the CTools ajax sample module

It seems that I would have to (re)build the form with the equivalent native 7.x drupal_build_form, but there are obviously differences between the ctools 6.x ajax framework and the new native drupal ajax framework. I've tried a few variations of the above, but it's not working for me.

Any clue would be appreciated.

Cheers