[SalesForce] RecordEditForm: Reset inputfield after successful submit

I have a Lightning RecordEditForm on a page that I'd like use multiple times. After a successful submit I want to clear the user's entries to allow the form to be reused. I have been unsuccessful at clearing RecordEditForm InputField component values in the onsuccess callback of the form.

Here is what I am trying:

Component

<lightning:recordEditForm aura:id="createAccount"
                            objectApiName="Account"
                            onsuccess="{!c.saveComplete}">
    <lightning:messages />
    <lightning:inputField fieldName="Name"
                            aura:id="accountNameField" />
    <lightning:button aura:id="submit"
                        variant="brand"
                        type="submit"
                        label="Create Account"
                        class="slds-m-top_medium" />
</lightning:recordEditForm>

Controller

saveComplete: function (component, event, helper) {
    helper.getAccountList(component);

    // Grab inputField needing to be reset.  Attempt to change it.
    var cmp = component.find("accountNameField");
    console.log("current value: " + cmp.get("v.value"));    // Display current value

    cmp.set("v.value", "a new value");                      // Change it (hopefully)

    console.log("new value: " + cmp.get("v.value"));        // Display updated value
},

Console output

current value: cccc
new value: cccc

The user's inputed value does not change on the screen nor in the inputfield component attribute.

What is the proper way to reset a recordeditform inputfield after a submit completes?