Remove ALL xml

My company is changing processes away from an xml based workflow, so we have hundreds of InDesign files that need to have the xml removed. I'm writing a script that will do it automatically, but I'm having problems untagging all of the text. Most files have a structure like this:

My starting script here:

/*REMOVE TAGS*/

myDoc.xmlElements[0].xmlElements.everyItem().untag();

try{

myDoc.xmlInstructions[0].remove();

}

catch(e){};

myDoc.deleteUnusedTags();

var myRoot = myDoc.xmlTags[0].name;

$.writeln(myRoot);

myDoc.xmlTags.itemByName(myRoot).name = "Root";

/*END REMOVE TAGS*/

gives me this result:

I need help untagging the text leftover in the 'Root' tag so that my final result is this:

Any advice?