Delete scribble "Fill and Sign" signature with javascript

I have a reset button on my PDF that resets all form fields and would also like to delete any signatures using the "fill and sign" scribble tool (not the digital signature).

I am using the following code to try and accomplish this, but is not working (assuming the signature is not an annotation but an image?)

Is it possible to remove the scribble signature?

this.syncAnnotScan();

var annots = this.getAnnots({nPage:0});

if (annots) {

    var num = annots.length;

    for (var i = num - 1; i > -1; i--) {

       annots.destroy();

    }

}