How can I empty the form field after the form is submitted using ajax?

Hi, I'm using Ajax to submit form data to my database. It's working fine. The form submits the data, the database is updated and the success message is display except, I don't want the success message to replace the form. So I'm displaying the success message above the form when the form is submitted. However, because the page is not reloading, the data the user submit in the form stays in the form. One have to refresh the page in order to resubmit the form. How can I change this so when the form is submitted, the old data can be clear out of the form and the form can be ready again for another submission without user refreshing the page.

Thanks