IE has a security precaution when fiddling with the DOM. When creating a DOM element in one context, it will not let you move it to another context in a different window, even a child iframe.

Example:

var iframe = $('iframe')[0];
$(iframe.contentWindow.document.body).append('<div>This is a test</div>');

Throws an exception "invalid argument". Note that this code works fine in FF and Opera, it's just an IE issue. In stepping through the code, the clean method creates the dom elements under the context of the main page document. It seems to me that if the clean method could somehow use the document in the context of the element being manipulated, it would solve this problem.

JK