Remove security code after failed credit card transaction

Hi,

On a site I’ve just built for my clients, they note that after a credit card transaction fails during Checkout, the Card Security Code field remains filled out on the Checkout screen. According to them, “the convention is to remove Security Code information.”

The issue can be found at http://drinkreorient.com. We are using the WooCommerce Authorize.net CIM Gateway add-on for this.

Is there any way to fulfill their wish and remove (or mask) the entered security code information after a failed transaction?