Try this:
$('*').contents().each(function() {
if(this.nodeType === Node.COMMENT_NODE) {
$(this).remove();
}
});
EDIT: This removes the elements from the DOM. Browsers often store a copy of the original page source that is accessible through a menu item. This doesn't get updated.
If you want to hide your comments, you could always insert your entire HTML markup (with comments) into the DOM using javascript. The javascript could, of course, be viewed, but it is a step removed from the first place people would look.
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